refactor: enhance styling and structure in DayDetailContent component

- Updated list styling in DayDetailContent to use a cleaner format without bullet points, improving visual consistency. - Added decorative bullet points for duty, unavailable, vacation, and event summaries to enhance readability. - Adjusted spacing and layout for better alignment of list items, ensuring a more polished user interface.
fix: adjust animation duration for SheetContent component
2026-03-04 10:06:22 +03:00 · 2026-03-03 19:47:49 +03:00 · 2026-03-03 18:55:33 +03:00 · 2026-03-03 18:43:45 +03:00 · 2026-03-03 18:29:34 +03:00 · 2026-03-03 18:19:52 +03:00
174 changed files with 21859 additions and 7201 deletions
--- a/.cursor/rules/backend.mdc
+++ b/.cursor/rules/backend.mdc
@@ -0,0 +1,150 @@
+---
+description: Rules for working with the Python backend (duty_teller/)
+globs:
+  - duty_teller/**
+  - alembic/**
+  - tests/**
+---
+
+# Backend — Python
+
+## Package layout
+
+```
+duty_teller/
+├── main.py / run.py          # Entry point: bot + uvicorn
+├── config.py                  # Settings from env vars (python-dotenv)
+├── cache.py                   # TTL caches with pattern invalidation
+├── api/                       # FastAPI app, routes, auth, ICS endpoints
+│   ├── app.py                 # FastAPI app creation, route registration, static mount
+│   ├── dependencies.py        # get_db_session, require_miniapp_username, get_validated_dates
+│   ├── telegram_auth.py       # initData HMAC validation
+│   ├── calendar_ics.py        # External ICS fetch & parse
+│   └── personal_calendar_ics.py
+├── db/                        # Database layer
+│   ├── models.py              # SQLAlchemy ORM models (Base)
+│   ├── repository.py          # CRUD functions (receive Session)
+│   ├── schemas.py             # Pydantic response schemas
+│   └── session.py             # session_scope, get_engine, get_session
+├── handlers/                  # Telegram bot command/message handlers
+│   ├── commands.py            # /start, /help, /set_phone, /calendar_link, /set_role
+│   ├── common.py              # is_admin_async, invalidate_is_admin_cache
+│   ├── errors.py              # Global error handler
+│   ├── group_duty_pin.py      # Pinned duty message in group chats
+│   └── import_duty_schedule.py
+├── i18n/                      # Translations
+│   ├── core.py                # get_lang, t()
+│   ├── lang.py                # normalize_lang
+│   └── messages.py            # MESSAGES dict (ru/en)
+├── importers/                 # File parsers
+│   └── duty_schedule.py       # parse_duty_schedule
+├── services/                  # Business logic (receives Session)
+│   ├── import_service.py      # run_import
+│   └── group_duty_pin_service.py
+└── utils/                     # Shared helpers
+    ├── dates.py
+    ├── handover.py
+    ├── http_client.py
+    └── user.py
+```
+
+## Imports
+
+- Use absolute imports from the `duty_teller` package: `from duty_teller.db.repository import get_or_create_user`.
+- Never import handler modules from services or repository — dependency flows
+  downward: handlers → services → repository → models.
+
+## DB access pattern
+
+Handlers are async; SQLAlchemy sessions are synchronous. Two patterns:
+
+### In bot handlers — `session_scope` + `run_in_executor`
+
+```python
+def do_work():
+    with session_scope(config.DATABASE_URL) as session:
+        # synchronous DB code here
+        ...
+
+await asyncio.get_running_loop().run_in_executor(None, do_work)
+```
+
+### In FastAPI endpoints — dependency injection
+
+```python
+@router.get("/api/duties")
+def get_duties(session: Session = Depends(get_db_session)):
+    ...
+```
+
+`get_db_session` yields a `session_scope` context — FastAPI closes it after the request.
+
+## Handler patterns
+
+### Admin-only commands
+
+```python
+if not await is_admin_async(update.effective_user.id):
+    await update.message.reply_text(t(lang, "import.admin_only"))
+    return
+```
+
+`is_admin_async` is cached for 60 s and invalidated on role changes.
+
+### i18n in handlers
+
+```python
+lang = get_lang(update.effective_user)
+text = t(lang, "start.greeting")
+```
+
+`t(lang, key, **kwargs)` substitutes `{placeholders}` and falls back to English → raw key.
+
+### Error handling
+
+The global `error_handler` (registered via `app.add_error_handler`) logs the
+exception and sends a generic localized error reply.
+
+## Service layer
+
+- Services receive a `Session` — they never open their own.
+- Services call repository functions, never handler code.
+- After mutations that affect cached data, call `invalidate_duty_related_caches()`.
+
+## Cache invalidation
+
+Three TTL caches in `cache.py`:
+
+| Cache | TTL | Invalidation trigger |
+|-------|-----|---------------------|
+| `ics_calendar_cache` | 600 s | After duty import |
+| `duty_pin_cache` | 90 s | After duty import |
+| `is_admin_cache` | 60 s | After `set_user_role` |
+
+- `invalidate_duty_related_caches()` clears ICS and pin caches (call after any duty mutation).
+- `invalidate_is_admin_cache(telegram_user_id)` clears a single admin entry.
+- Pattern invalidation: `cache.invalidate_pattern(key_prefix_tuple)`.
+
+## Alembic migrations
+
+- Config in `pyproject.toml` under `[tool.alembic]`, script location: `alembic/`.
+- **Naming convention:** `NNN_description.py` — sequential zero-padded number (`001`, `002`, …).
+- Revision IDs are the string number: `revision = "008"`, `down_revision = "007"`.
+- Run: `alembic -c pyproject.toml upgrade head` / `downgrade -1`.
+- `entrypoint.sh` runs `alembic upgrade head` before starting the app in Docker.
+
+## Configuration
+
+- All config comes from environment variables, loaded with `python-dotenv`.
+- `duty_teller/config.py` exposes module-level constants (`BOT_TOKEN`, `DATABASE_URL`, etc.)
+  built from `Settings.from_env()`.
+- Never hardcode secrets or URLs — always use `config.*` constants.
+- Key variables: `BOT_TOKEN`, `DATABASE_URL`, `MINI_APP_BASE_URL`, `HTTP_HOST`, `HTTP_PORT`,
+  `ADMIN_USERNAMES`, `ALLOWED_USERNAMES`, `DUTY_DISPLAY_TZ`, `DEFAULT_LANGUAGE`.
+
+## Code style
+
+- Formatter: Black (line-length 120).
+- Linter: Ruff (`ruff check duty_teller tests`).
+- Follow PEP 8 and Google Python Style Guide for docstrings.
+- Max line length: 120 characters.
--- a/.cursor/rules/frontend.mdc
+++ b/.cursor/rules/frontend.mdc
@@ -0,0 +1,53 @@
+---
+description: Rules for working with the Telegram Mini App frontend (webapp-next/)
+globs:
+  - webapp-next/**
+---
+
+# Frontend — Telegram Mini App (Next.js)
+
+The Mini App lives in `webapp-next/`. It is built as a static export and served by FastAPI at `/app`.
+
+## Stack
+
+- **Next.js** (App Router, `output: 'export'`, `basePath: '/app'`)
+- **TypeScript**
+- **Tailwind CSS** — theme extended with custom tokens (surface, muted, accent, duty, today, etc.)
+- **shadcn/ui** — Button, Card, Sheet, Popover, Tooltip, Skeleton, Badge
+- **Zustand** — app store (month, lang, duties, calendar events, loading, view state)
+- **@telegram-apps/sdk-react** — SDKProvider, useThemeParams, useLaunchParams, useMiniApp, useBackButton
+
+## Structure
+
+| Area | Location |
+|------|----------|
+| App entry, layout | `src/app/layout.tsx`, `src/app/page.tsx` |
+| Providers | `src/components/providers/TelegramProvider.tsx` |
+| Calendar | `src/components/calendar/` — CalendarHeader, CalendarGrid, CalendarDay, DayIndicators |
+| Duty list | `src/components/duty/` — DutyList, DutyTimelineCard, DutyItem |
+| Day detail | `src/components/day-detail/` — DayDetail (Sheet/Popover), DayDetailContent |
+| Current duty view | `src/components/current-duty/CurrentDutyView.tsx` |
+| Contact links | `src/components/contact/ContactLinks.tsx` |
+| State views | `src/components/states/` — LoadingState, ErrorState, AccessDenied |
+| Hooks | `src/hooks/` — use-telegram-theme, use-telegram-auth, use-month-data, use-swipe, use-media-query, use-sticky-scroll, use-auto-refresh |
+| Lib | `src/lib/` — api, calendar-data, date-utils, phone-format, constants, utils |
+| i18n | `src/i18n/` — messages.ts, use-translation.ts |
+| Store | `src/store/app-store.ts` |
+| Types | `src/types/index.ts` |
+
+## Conventions
+
+- **Client components:** Use `'use client'` where hooks or browser APIs are used (layout loads config script; page and most UI are client).
+- **Theme:** CSS variables in `globals.css`; `useTelegramTheme` maps Telegram theme params to `--tg-theme-*` and sets `data-theme` on `<html>`.
+- **Auth:** `useTelegramAuth` provides initData for API; access gated for non-Telegram except localhost.
+- **i18n:** `useTranslation()` from store lang; `window.__DT_LANG` set by `/app/config.js` (backend).
+- **API:** `fetchDuties`, `fetchCalendarEvents` in `src/lib/api.ts`; pass initData, lang, AbortSignal; handle ACCESS_DENIED.
+
+## Testing
+
+- **Runner:** Vitest in `webapp-next/`; environment: jsdom; React Testing Library.
+- **Config:** `webapp-next/vitest.config.ts`; setup in `src/test/setup.ts`.
+- **Run:** `cd webapp-next && npm test` (or `npm run test`). Build: `npm run build`.
+- **Coverage:** Unit tests for lib (api, date-utils, calendar-data, i18n, etc.) and component tests for calendar, duty list, day detail, current duty, states.
+
+Consider these rules when changing the Mini App or adding frontend features.
--- a/.cursor/rules/project.mdc
+++ b/.cursor/rules/project.mdc
@@ -0,0 +1,113 @@
+---
+description: Overall project architecture and context for duty-teller
+globs:
+  - "**"
+---
+
+# Project — duty-teller
+
+A Telegram bot for team duty shift calendar management and group reminders,
+with a Telegram Mini App (webapp) for calendar visualization.
+
+## Architecture
+
+```
+┌──────────────┐   polling    ┌──────────────────────┐
+│  Telegram    │◄────────────►│  python-telegram-bot  │
+│  Bot API     │              │  (handlers/)          │
+└──────────────┘              └──────────┬───────────┘
+                                         │
+┌──────────────┐   HTTP       ┌──────────▼───────────┐
+│  Telegram    │◄────────────►│  FastAPI (api/)       │
+│  Mini App    │  initData    │  + static webapp      │
+│  (webapp-next/) │  auth     └──────────┬───────────┘
+└──────────────┘                         │
+                              ┌──────────▼───────────┐
+                              │  SQLite + SQLAlchemy  │
+                              │  (db/)                │
+                              └──────────────────────┘
+```
+
+- **Bot:** python-telegram-bot v22, async polling mode.
+- **API:** FastAPI served by uvicorn in a daemon thread alongside the bot.
+- **Database:** SQLite via SQLAlchemy 2.x ORM; Alembic for migrations.
+- **Frontend:** Next.js (TypeScript, Tailwind, shadcn/ui) static export at `/app`; source in `webapp-next/`.
+
+## Key packages
+
+| Package | Role |
+|---------|------|
+| `duty_teller/handlers/` | Telegram bot command and message handlers |
+| `duty_teller/api/` | FastAPI app, REST endpoints, Telegram initData auth, ICS feeds |
+| `duty_teller/db/` | ORM models, repository (CRUD), session management, Pydantic schemas |
+| `duty_teller/services/` | Business logic (import, duty pin) — receives Session |
+| `duty_teller/importers/` | Duty schedule file parsers |
+| `duty_teller/i18n/` | Bilingual translations (ru/en), `t()` function |
+| `duty_teller/utils/` | Date helpers, user utilities, HTTP client |
+| `duty_teller/cache.py` | TTL caches with pattern-based invalidation |
+| `duty_teller/config.py` | Environment-based configuration |
+| `webapp-next/` | Telegram Mini App (Next.js, Tailwind, shadcn/ui; build → `out/`) |
+
+## API endpoints
+
+| Method | Path | Auth | Purpose |
+|--------|------|------|---------|
+| GET | `/health` | None | Health check |
+| GET | `/api/duties` | initData | Duties for date range |
+| GET | `/api/calendar-events` | initData | External calendar events |
+| GET | `/api/calendar/ical/team/{token}.ics` | Token | Team ICS feed |
+| GET | `/api/calendar/ical/{token}.ics` | Token | Personal ICS feed |
+| GET | `/app` | None | Static Mini App (HTML/JS/CSS) |
+
+## Deployment
+
+- **Docker:** Multi-stage build (`Dockerfile`), `docker-compose.prod.yml` for production.
+- **Entrypoint:** `entrypoint.sh` runs `alembic -c pyproject.toml upgrade head`, then
+  starts `python main.py` as `botuser`.
+- **Data:** SQLite DB persisted via Docker volume at `/app/data`.
+- **Health:** `curl -f http://localhost:8080/health` every 30 s.
+
+## CI/CD (Gitea Actions)
+
+### Lint & test (`.gitea/workflows/ci.yml`)
+
+Triggered on push/PR to `main` and `develop`:
+
+1. **Ruff:** `ruff check duty_teller tests`
+2. **Pytest:** `pytest tests/ -v` (80% coverage gate)
+3. **Bandit:** `bandit -r duty_teller -ll` (security scan)
+
+### Docker build & release (`.gitea/workflows/docker-build.yml`)
+
+Triggered on `v*` tags:
+
+1. Build and push image to Gitea registry.
+2. Create release with auto-generated notes.
+
+## Key environment variables
+
+| Variable | Default | Required | Purpose |
+|----------|---------|----------|---------|
+| `BOT_TOKEN` | — | Yes | Telegram bot API token |
+| `DATABASE_URL` | `sqlite:///data/duty_teller.db` | No | SQLAlchemy database URL |
+| `MINI_APP_BASE_URL` | — | Yes (prod) | Public URL for the Mini App |
+| `HTTP_HOST` | `127.0.0.1` | No | FastAPI bind host |
+| `HTTP_PORT` | `8080` | No | FastAPI bind port |
+| `ADMIN_USERNAMES` | — | No | Comma-separated admin Telegram usernames |
+| `ALLOWED_USERNAMES` | — | No | Comma-separated allowed usernames |
+| `DUTY_DISPLAY_TZ` | `Europe/Moscow` | No | Timezone for duty display |
+| `DEFAULT_LANGUAGE` | `en` | No | Default UI language (`en` or `ru`) |
+| `EXTERNAL_CALENDAR_ICS_URL` | — | No | External ICS URL for holidays |
+| `CORS_ORIGINS` | `*` | No | Comma-separated CORS origins |
+
+## Languages
+
+- **Backend:** Python 3.12+
+- **Frontend:** Next.js (TypeScript), Tailwind CSS, shadcn/ui; Vitest for tests
+- **i18n:** Russian (default) and English
+
+## Version control
+
+- Git with Gitea Flow branching strategy.
+- Conventional Commits for commit messages.
+- PRs reviewed via Gitea Pull Requests.
--- a/.cursor/rules/testing.mdc
+++ b/.cursor/rules/testing.mdc
@@ -0,0 +1,83 @@
+---
+description: Rules for writing and running tests
+globs:
+  - tests/**
+  - webapp-next/src/**/*.test.{ts,tsx}
+---
+
+# Testing
+
+## Python tests (pytest)
+
+### Configuration
+
+- Config in `pyproject.toml` under `[tool.pytest.ini_options]`.
+- `asyncio_mode = "auto"` — async test functions are detected automatically, no decorator needed.
+- Coverage: `--cov=duty_teller --cov-fail-under=80`.
+- Run: `pytest tests/ -v` from project root.
+
+### File layout
+
+```
+tests/
+├── conftest.py       # Shared fixtures (in-memory DB, sessions, bot app)
+├── helpers.py        # Test helper functions
+└── test_*.py         # Test modules
+```
+
+### Key fixtures (conftest.py)
+
+- `conftest.py` sets `BOT_TOKEN=test-token-for-pytest` if the env var is missing,
+  so tests run without a real token.
+- Database fixtures use in-memory SQLite for isolation.
+
+### Writing Python tests
+
+- File naming: `tests/test_<module>.py` (e.g. `tests/test_import_service.py`).
+- Function naming: `test_<what>_<scenario>` or `test_<what>_<expected_result>`.
+- Use `session_scope` with the test database URL for DB tests.
+- Async tests: just use `async def test_...` — `asyncio_mode = "auto"` handles it.
+- Mock external dependencies (Telegram API, HTTP calls) with `unittest.mock` or `pytest-mock`.
+
+### Example structure
+
+```python
+import pytest
+from duty_teller.db.session import session_scope
+
+def test_get_or_create_user_creates_new(test_db_url):
+    with session_scope(test_db_url) as session:
+        user = get_or_create_user(session, telegram_user_id=123, full_name="Test")
+        assert user.telegram_user_id == 123
+```
+
+## Frontend tests (Vitest + React Testing Library)
+
+### Configuration
+
+- Config: `webapp-next/vitest.config.ts`.
+- Environment: jsdom; React Testing Library for components.
+- Test files: `webapp-next/src/**/*.test.{ts,tsx}` (co-located or in test files).
+- Setup: `webapp-next/src/test/setup.ts`.
+- Run: `cd webapp-next && npm test` (or `npm run test`).
+
+### Writing frontend tests
+
+- Pure lib modules: unit test with Vitest (`describe` / `it` / `expect`).
+- React components: use `@testing-library/react` (render, screen, userEvent); wrap with required providers (e.g. TelegramProvider, store) via `src/test/test-utils.tsx` where needed.
+- Mock Telegram SDK and API fetch where necessary.
+- File naming: `<module>.test.ts` or `<Component>.test.tsx`.
+
+### Example structure
+
+```ts
+import { describe, it, expect } from "vitest";
+import { localDateString } from "./date-utils";
+
+describe("localDateString", () => {
+  it("formats date as YYYY-MM-DD", () => {
+    const d = new Date(2025, 0, 15);
+    expect(localDateString(d)).toBe("2025-01-15");
+  });
+});
+```
--- a/.cursor/worktrees.json
+++ b/.cursor/worktrees.json
@@ -0,0 +1,5 @@
+{
+  "setup-worktree": [
+    "npm install"
+  ]
+}
--- a/.env.example
+++ b/.env.example
@@ -26,7 +26,10 @@ ADMIN_USERNAMES=admin1,admin2
 # When the pinned duty message is updated on schedule, re-pin so members get a notification (default: 1). Set to 0 or false to disable.
 # DUTY_PIN_NOTIFY=1

-# Default UI language when user language is unknown: en or ru (default: en).
+# Log level for backend and Mini App console logs: DEBUG, INFO, WARNING, ERROR. Default: INFO.
+# LOG_LEVEL=INFO
+
+# Single source of language for bot, API, and Mini App (en or ru). Default: en. No auto-detection.
 # DEFAULT_LANGUAGE=en

 # Reject Telegram initData older than this (seconds). 0 = do not check (default).
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -26,6 +26,15 @@ jobs:
        run: |
          pip install ruff bandit

+      - name: Set up Node.js
+        uses: https://gitea.com/actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Webapp (Next.js) build and test
+        run: |
+          cd webapp-next && npm ci && npm test && npm run build
+
      - name: Lint with Ruff
        run: |
          ruff check duty_teller tests
@@ -39,14 +48,3 @@ jobs:
      - name: Security check with Bandit
        run: |
          bandit -r duty_teller -ll
-
-      - name: Set up Node.js
-        uses: https://gitea.com/actions/setup-node@v4
-        with:
-          node-version: "20"
-
-      - name: Webapp tests
-        run: |
-          cd webapp
-          npm ci
-          npm run test
--- a/.gitignore
+++ b/.gitignore
@@ -7,11 +7,18 @@ venv/
 *.pyo
 data/
 *.db
-.cursor/
-.cursorrules/
+
 # Test and coverage artifacts
 .coverage
 htmlcov/
 .pytest_cache/
 *.cover
 *.plan.md
+
+# Logs
+*.log
+
+# Next.js webapp
+webapp-next/out/
+webapp-next/node_modules/
+webapp-next/.next/
--- a/AGENTS.md
+++ b/AGENTS.md
@@ -0,0 +1,51 @@
+# Duty Teller — AI agent documentation
+
+This file is for AI assistants (e.g. Cursor) and maintainers. All project documentation and docstrings must be in **English**. User-facing UI strings remain localized (ru/en) in `duty_teller/i18n/`.
+
+## Project summary
+
+Duty Teller is a Telegram bot plus Mini App for team duty shift calendar and group reminders. Stack: python-telegram-bot v22, FastAPI, SQLite (SQLAlchemy), Next.js (static export) Mini App. The bot and web UI support Russian and English; configuration and docs are in English.
+
+## Key entry points
+
+- **CLI / process:** `main.py` or, after `pip install -e .`, the `duty-teller` console command. Both delegate to `duty_teller.run.main()`.
+- **Application setup:** `duty_teller/run.py` — builds the Telegram `Application`, registers handlers via `register_handlers(app)`, runs polling and FastAPI in a thread, calls `config.require_bot_token()` so the app exits clearly if `BOT_TOKEN` is missing.
+- **HTTP API:** `duty_teller/api/app.py` — FastAPI app, route registration, static webapp mounted at `/app`.
+
+## Where to change what
+
+| Area | Location |
+|------|----------|
+| Telegram handlers | `duty_teller/handlers/` |
+| REST API | `duty_teller/api/` |
+| Business logic | `duty_teller/services/` |
+| Database (models, repository, schemas) | `duty_teller/db/` |
+| Translations (ru/en) | `duty_teller/i18n/` |
+| Duty-schedule parser | `duty_teller/importers/` |
+| Config (env vars) | `duty_teller/config.py` |
+| Miniapp frontend | `webapp-next/` (Next.js, Tailwind, shadcn/ui; static export in `webapp-next/out/`) |
+| Migrations | `alembic/` (config in `pyproject.toml` under `[tool.alembic]`) |
+
+## Running and testing
+
+- **Tests:** From repository root: `pytest`. Use `PYTHONPATH=.` if imports fail. See [CONTRIBUTING.md](CONTRIBUTING.md) and [README.md](README.md) for full setup. Frontend: `cd webapp-next && npm test && npm run build`.
+- **Lint:** `ruff check duty_teller tests`
+- **Security:** `bandit -r duty_teller -ll`
+
+## Documentation
+
+- User and architecture docs: [docs/](docs/), [docs/architecture.md](docs/architecture.md).
+- Configuration reference: [docs/configuration.md](docs/configuration.md).
+- Build docs: `pip install -e ".[docs]"`, then `mkdocs build` / `mkdocs serve`.
+
+Docstrings and code comments must be in English (Google-style docstrings). UI strings are the only exception; they live in `duty_teller/i18n/`.
+
+## Conventions
+
+- **Commits:** [Conventional Commits](https://www.conventionalcommits.org/) (e.g. `feat:`, `fix:`, `docs:`).
+- **Branches:** Gitea Flow; changes via Pull Request.
+- **Testing:** pytest, 80% coverage target; unit and integration tests.
+- **Config:** Environment variables (e.g. `.env`); no hardcoded secrets.
+- **Database:** One logical transaction per `session_scope` — a single `commit` at the end of the business operation (e.g. in `run_import`). Repository helpers used inside such a flow (e.g. `get_or_create_user_by_full_name`) accept `commit=False` and let the caller commit once.
+- **Error handling:** Do not send `str(exception)` from parsers or DB to the user. Use generic i18n keys (e.g. `import.parse_error_generic`, `import.import_error_generic`) and log the full exception server-side.
+- **Cursor:** The project does not version `.cursor/`. You can mirror this file in `.cursor/rules/` locally; [AGENTS.md](AGENTS.md) is the single versioned reference for AI and maintainers.
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,9 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0

 ## [Unreleased]

+## [2.0.0] - 2026-03-03
+
 ### Added

- **Group duty pin**: when the pinned duty message is updated on schedule, the bot re-pins it so group members get a Telegram notification. Configurable via `DUTY_PIN_NOTIFY` (default: enabled); set to `0` or `false` to only edit the message without re-pinning.
+- **Group duty pin**: when the pinned duty message is updated on schedule, the bot re-pins it so group members get a Telegram notification. Configurable via `DUTY_PIN_NOTIFY` (default: enabled); set to `0` or `false` to pin without notification. The first pin (e.g. when the bot is added to the group or on `/pin_duty`) is always silent.
+- **Command `/refresh_pin`**: in a group, immediately refresh the pinned duty message (send new message, unpin old, pin new).
+- **Role-based access and `/set_role`**: Miniapp and admin access are determined by roles stored in the database (`roles` table, `users.role_id`). Roles: `user` (miniapp access), `admin` (miniapp + `/import_duty_schedule`, `/set_role`). Admins assign roles with `/set_role @username user|admin` (or reply to a message with `/set_role user|admin`). `ALLOWED_USERNAMES` and `ALLOWED_PHONES` are no longer used for access (kept for reference).
+- **Command `/calendar_link`**: in private chat, send the user their personal ICS subscription URL (and team calendar URL) for calendar apps.
+- **Config `MINI_APP_SHORT_NAME`**: when set, the pinned duty message "View contacts" button uses a direct Mini App link (`https://t.me/BotName/ShortName?startapp=duty`) so the app opens on the current-duty view.
+- **Config `LOG_LEVEL`**: control backend logging and the Miniapp console logger (`window.__DT_LOG_LEVEL`); one of `DEBUG`, `INFO`, `WARNING`, `ERROR` (default: `INFO`).
+- **Mini App**: migrated to Next.js (TypeScript, Tailwind, shadcn/ui) with static export; improved loading states, duty timeline styling, and content readiness handling; configurable loopback host for health checks.

 ### Changed

@@ -36,4 +44,5 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Input validation and initData hash verification for Miniapp access.
 - Optional CORS and init_data_max_age; use env for secrets.

+[2.0.0]: https://github.com/your-org/duty-teller/releases/tag/v2.0.0  <!-- placeholder: set to your repo URL when publishing -->
 [0.1.0]: https://github.com/your-org/duty-teller/releases/tag/v0.1.0  <!-- placeholder: set to your repo URL when publishing -->
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -53,6 +53,15 @@
  bandit -r duty_teller -ll
  ```

+## Documentation
+
+All project documentation must be in **English**. This includes:
+
+- README, files in `docs/`, docstrings, and commit messages that touch documentation.
+- Exception: user-facing UI strings are localized (Russian/English) in `duty_teller/i18n/` and are not considered project documentation.
+
+Docstrings and code comments must be in English (Google-style docstrings). See [AGENTS.md](AGENTS.md) for AI/maintainer context.
+
 ## Commit messages

 Use [Conventional Commits](https://www.conventionalcommits.org/), e.g.:
--- a/16
+++ b/16
@@ -1,14 +1,22 @@
-# Multi-stage: builder installs deps; runtime copies only site-packages and app code.
+# Multi-stage: webapp build (Next.js), Python builder, runtime.
 # Single image for both dev and prod; Compose files differentiate behavior.

-# --- Stage 1: builder (dependencies only) ---
+# --- Stage 1: webapp build (Next.js static export) ---
+FROM node:20-slim AS webapp-builder
+WORKDIR /webapp
+COPY webapp-next/package.json webapp-next/package-lock.json* ./
+RUN npm ci
+COPY webapp-next/ ./
+RUN npm run build
+
+# --- Stage 2: builder (Python dependencies only) ---
 FROM python:3.12-slim AS builder
 WORKDIR /app
 COPY pyproject.toml ./
 COPY duty_teller/ ./duty_teller/
 RUN pip install --no-cache-dir .

-# --- Stage 2: runtime (minimal final image) ---
+# --- Stage 3: runtime (minimal final image) ---
 FROM python:3.12-slim

 WORKDIR /app
@@ -27,7 +35,7 @@ COPY main.py pyproject.toml entrypoint.sh ./
 RUN chmod +x entrypoint.sh
 COPY duty_teller/ ./duty_teller/
 COPY alembic/ ./alembic/
-COPY webapp/ ./webapp/
+COPY --from=webapp-builder /webapp/out ./webapp-next/out

 # Create data dir; entrypoint runs as root, fixes perms for volume, then runs app as botuser
 RUN adduser --disabled-password --gecos "" botuser \
--- a/README.md
+++ b/README.md
@@ -106,7 +106,7 @@ High-level architecture (components, data flow, package relationships) is descri
 - `main.py` – Entry point: calls `duty_teller.run:main`. Alternatively, after `pip install -e .`, run the console command **`duty-teller`** (see `pyproject.toml` and `duty_teller/run.py`). The runner builds the `Application`, registers handlers, runs polling and FastAPI in a thread, and calls `duty_teller.config.require_bot_token()` so the app exits with a clear message if `BOT_TOKEN` is missing.
 - `duty_teller/` – Main package (install with `pip install -e .`). Contains:
  - `config.py` – Loads `BOT_TOKEN`, `DATABASE_URL`, `ALLOWED_USERNAMES`, etc. from env; no exit on import; use `require_bot_token()` in the entry point when running the bot. Optional `Settings` dataclass for tests. `PROJECT_ROOT` for webapp path.
-  - `api/` – FastAPI app (`/api/duties`, `/api/calendar-events`), `dependencies.py` (DB session, auth, date validation), static webapp mounted from `PROJECT_ROOT/webapp`.
+  - `api/` – FastAPI app (`/api/duties`, `/api/calendar-events`), `dependencies.py` (DB session, auth, date validation), static webapp mounted from `PROJECT_ROOT/webapp-next/out` (built from `webapp-next/`).
  - `db/` – SQLAlchemy models, session (`session_scope`), repository, schemas.
  - `handlers/` – Telegram command and chat handlers; register via `register_handlers(app)`.
  - `i18n/` – Translations and language detection (ru/en); used by handlers and API.
@@ -114,7 +114,7 @@ High-level architecture (components, data flow, package relationships) is descri
  - `utils/` – Shared date, user, and handover helpers.
  - `importers/` – Duty-schedule JSON parser.
 - `alembic/` – Migrations; config in `pyproject.toml` under `[tool.alembic]`; URL and metadata from `duty_teller.config` and `duty_teller.db.models.Base`. Run: `alembic -c pyproject.toml upgrade head`.
- `webapp/` – Miniapp UI (calendar, duty list); served at `/app`.
+- `webapp-next/` – Miniapp UI (Next.js, TypeScript, Tailwind, shadcn/ui); build output in `webapp-next/out/`, served at `/app`.
 - `tests/` – Tests; `helpers.py` provides `make_init_data` for auth tests.
 - `pyproject.toml` – Installable package (`pip install -e .`).

@@ -151,6 +151,7 @@ Tests cover `api/telegram_auth` (validate_init_data, auth_date expiry), `config`
 - **Commits:** Use [Conventional Commits](https://www.conventionalcommits.org/): `feat:`, `fix:`, `docs:`, `refactor:`, `test:`, `chore:`, etc.
 - **Branches:** Follow [Gitea Flow](https://docs.gitea.io/en-us/workflow-branching/): main branch `main`, features and fixes in separate branches.
 - **Changes:** Via **Pull Request** in Gitea; run linters and tests (`ruff check .`, `pytest`) before merge.
+- **Documentation:** Project documentation is in English; see [CONTRIBUTING.md](CONTRIBUTING.md) for details.

 ## Logs and rotation

--- a/docs/architecture.md
+++ b/docs/architecture.md
@@ -5,7 +5,7 @@ High-level architecture of Duty Teller: components, data flow, and package relat
 ## Components

 - **Bot** — [python-telegram-bot](https://github.com/python-telegram-bot/python-telegram-bot) v22 (Application API). Handles commands and group messages; runs in polling mode.
- **FastAPI** — HTTP server: REST API (`/api/duties`, `/api/calendar-events`, `/api/calendar/ical/{token}.ics`) and static miniapp at `/app`. Runs in a separate thread alongside the bot.
+- **FastAPI** — HTTP server: REST API (`/api/duties`, `/api/calendar-events`, `/api/calendar/ical/{token}.ics`) and static miniapp at `/app` (built from `webapp-next/`, Next.js static export). Runs in a separate thread alongside the bot.
 - **Database** — SQLAlchemy ORM with Alembic migrations. Default backend: SQLite (`data/duty_teller.db`). Stores users, duties (with event types: duty, unavailable, vacation), group duty pins, calendar subscription tokens.
 - **Duty-schedule import** — Two-step admin flow: handover time (timezone → UTC), then JSON file. Parser produces per-person date lists; import service deletes existing duties in range and inserts new ones.
 - **Group duty pin** — In groups, the bot can pin the current duty message; time/timezone for the pinned text come from `DUTY_DISPLAY_TZ`. Pin state is restored on startup from the database. When the duty changes on schedule, the bot sends a new message, unpins the previous one and pins the new one; if `DUTY_PIN_NOTIFY` is enabled (default), pinning the new message triggers a Telegram notification for members. The first pin (bot added to group or `/pin_duty`) is always silent.
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -5,21 +5,23 @@ All configuration is read from the environment (e.g. `.env` via python-dotenv).
 | Variable | Type / format | Default | Description |
 |----------|----------------|---------|-------------|
 | **BOT_TOKEN** | string | *(empty)* | Telegram bot token from [@BotFather](https://t.me/BotFather). Required for the bot to run; if unset, the entry point exits with a clear message. The server that serves the Mini App API must use the **same** token as the bot; otherwise initData validation returns `hash_mismatch`. |
-| **DATABASE_URL** | string (SQLAlchemy URL) | `sqlite:///data/duty_teller.db` | Database connection URL. Example: `sqlite:///data/duty_teller.db`. |
+| **DATABASE_URL** | string (SQLAlchemy URL) | `sqlite:///data/duty_teller.db` | Database connection URL. Should start with `sqlite://` or `postgresql://`; a warning is logged at startup if the format is unexpected. Example: `sqlite:///data/duty_teller.db`. |
 | **MINI_APP_BASE_URL** | string (URL, no trailing slash) | *(empty)* | Base URL of the miniapp (for documentation and CORS). Trailing slash is stripped. Example: `https://your-domain.com/app`. |
+| **MINI_APP_SHORT_NAME** | string | *(empty)* | Short name of the Web App in BotFather (e.g. `DutyApp`). When set, the pinned duty message "View contacts" button uses a direct Mini App link `https://t.me/BotName/ShortName?startapp=duty` so the app opens on the current-duty view. If unset, the button uses `https://t.me/BotName?startapp=duty` (user may land in bot chat first). |
 | **HTTP_HOST** | string | `127.0.0.1` | Host to bind the HTTP server to. Use `127.0.0.1` to listen only on localhost; use `0.0.0.0` to accept connections from all interfaces (e.g. when behind a reverse proxy on another machine). |
-| **HTTP_PORT** | integer | `8080` | Port for the HTTP server (FastAPI + static webapp). |
+| **HTTP_PORT** | integer (1–65535) | `8080` | Port for the HTTP server (FastAPI + static webapp). Invalid or out-of-range values are clamped; non-numeric values fall back to 8080. |
 | **ALLOWED_USERNAMES** | comma-separated list | *(empty)* | **Not used for access.** Kept for reference only. Access to the miniapp is controlled by **roles in the DB** (assigned by an admin via `/set_role`). |
 | **ADMIN_USERNAMES** | comma-separated list | *(empty)* | Telegram usernames treated as **admin fallback** when the user has **no role in the DB**. If a user has a role in the DB, only that role applies. Example: `admin1,admin2`. |
 | **ALLOWED_PHONES** | comma-separated list | *(empty)* | **Not used for access.** Kept for reference only. |
 | **ADMIN_PHONES** | comma-separated list | *(empty)* | Phones treated as **admin fallback** when the user has **no role in the DB** (user sets phone via `/set_phone`). Comparison uses digits only. Example: `+7 999 123-45-67`. |
-| **MINI_APP_SKIP_AUTH** | `1`, `true`, or `yes` | *(unset)* | If set, `/api/duties` and `/api/calendar-events` are allowed without Telegram initData. **Dev only — never use in production.** |
-| **INIT_DATA_MAX_AGE_SECONDS** | integer | `0` | Reject Telegram initData older than this many seconds. `0` = disabled. Example: `86400` for 24 hours. |
-| **CORS_ORIGINS** | comma-separated list | `*` | Allowed origins for CORS. Leave unset or set to `*` for allow-all. Example: `https://your-domain.com`. |
+| **MINI_APP_SKIP_AUTH** | `1`, `true`, or `yes` | *(unset)* | If set, `/api/duties` and `/api/calendar-events` are allowed without Telegram initData. **Dev only — never use in production.** The process exits with an error if this is set and **HTTP_HOST** is not localhost (127.0.0.1). |
+| **INIT_DATA_MAX_AGE_SECONDS** | integer (≥ 0) | `0` | Reject Telegram initData older than this many seconds. `0` = disabled. Invalid values fall back to 0. Example: `86400` for 24 hours. |
+| **CORS_ORIGINS** | comma-separated list | `*` | Allowed origins for CORS. Leave unset or set to `*` for allow-all. **In production**, set an explicit list (e.g. `https://your-domain.com`) instead of `*` to avoid allowing arbitrary origins. Example: `https://your-domain.com`. |
 | **EXTERNAL_CALENDAR_ICS_URL** | string (URL) | *(empty)* | URL of a public ICS calendar (e.g. holidays). If set, those days are highlighted on the duty grid; users can tap "i" on a cell to see the event summary. Empty = no external calendar. |
 | **DUTY_DISPLAY_TZ** | string (timezone name) | `Europe/Moscow` | Timezone for the pinned duty message in groups. Example: `Europe/Moscow`, `UTC`. |
 | **DUTY_PIN_NOTIFY** | `0`, `false`, or `no` to disable | `1` (enabled) | When the pinned duty message is updated on schedule, the bot sends a new message, unpins the old one and pins the new one. If enabled, pinning the new message sends a Telegram notification (“Bot pinned a message”). Set to `0`, `false`, or `no` to pin without notification. The first pin (e.g. when the bot is added to the group or on `/pin_duty`) is always silent. |
-| **DEFAULT_LANGUAGE** | `en` or `ru` (normalized) | `en` | Default UI language when the user's Telegram language is unknown. Values starting with `ru` are normalized to `ru`, otherwise `en`. |
+| **DEFAULT_LANGUAGE** | `en` or `ru` (normalized) | `en` | **Single source of language for the whole deployment:** bot messages, API error texts, and Mini App UI all use this value. No auto-detection from Telegram user, browser, or `Accept-Language`. Values starting with `ru` are normalized to `ru`; anything else becomes `en`. |
+| **LOG_LEVEL** | `DEBUG`, `INFO`, `WARNING`, or `ERROR` | `INFO` | Logging level for the backend (Python `logging`) and for the Mini App console logger (`window.__DT_LOG_LEVEL`). Use `DEBUG` for troubleshooting; in production `INFO` or higher is recommended. |

 ## Roles and access

--- a/docs/index.md
+++ b/docs/index.md
@@ -11,3 +11,5 @@ Telegram bot for team duty shift calendar and group reminder. The bot and web UI
 - [API Reference](api-reference.md) — Generated from code (api, db, services, handlers, importers, config).

 For quick start, setup, and API overview see the main [README](../README.md).
+
+**For maintainers and AI:** Project documentation and docstrings must be in English; see [CONTRIBUTING.md](../CONTRIBUTING.md#documentation). [AGENTS.md](../AGENTS.md) in the repo root provides entry points, conventions, and where to change what.
--- a/duty_teller/api/app.py
+++ b/duty_teller/api/app.py
@@ -5,11 +5,10 @@ import re
 from datetime import date, timedelta

 import duty_teller.config as config
-from starlette.middleware.base import BaseHTTPMiddleware

 from fastapi import Depends, FastAPI, Request
 from fastapi.middleware.cors import CORSMiddleware
-from fastapi.responses import Response
+from fastapi.responses import JSONResponse, Response
 from fastapi.staticfiles import StaticFiles
 from sqlalchemy.orm import Session

@@ -43,6 +42,16 @@ def _is_valid_calendar_token(token: str) -> bool:
 app = FastAPI(title="Duty Teller API")


+@app.exception_handler(Exception)
+def global_exception_handler(request: Request, exc: Exception) -> JSONResponse:
+    """Log unhandled exceptions and return 500 without exposing details to the client."""
+    log.exception("Unhandled exception: %s", exc)
+    return JSONResponse(
+        status_code=500,
+        content={"detail": "Internal server error"},
+    )
+
+
@app.get("/health", summary="Health check")
 def health() -> dict:
    """Return 200 when the app is up. Used by Docker HEALTHCHECK."""
@@ -58,22 +67,102 @@ app.add_middleware(
 )


-class NoCacheStaticMiddleware(BaseHTTPMiddleware):
-    """Set Cache-Control for /app/*.js and /app/*.html so WebView gets fresh JS (i18n, etc.)."""
+class NoCacheStaticMiddleware:
+    """
+    Raw ASGI middleware: Cache-Control: no-store for all /app and /app/* static files;
+    Vary: Accept-Language on all responses so reverse proxies do not serve one user's response to another.
+    """

-    async def dispatch(self, request, call_next):
-        response = await call_next(request)
-        path = request.url.path
-        if path.startswith("/app/") and (
-            path.endswith(".js") or path.endswith(".html")
-        ):
-            response.headers["Cache-Control"] = "no-store"
-        return response
+    def __init__(self, app, **kwargs):
+        self.app = app
+
+    async def __call__(self, scope, receive, send):
+        if scope["type"] != "http":
+            await self.app(scope, receive, send)
+            return
+
+        path = scope.get("path", "")
+        is_app_path = path == "/app" or path.startswith("/app/")
+
+        async def send_wrapper(message):
+            if message["type"] == "http.response.start":
+                headers = list(message.get("headers", []))
+                header_names = {h[0].lower(): i for i, h in enumerate(headers)}
+                if is_app_path:
+                    cache_control = (b"cache-control", b"no-store")
+                    if b"cache-control" in header_names:
+                        headers[header_names[b"cache-control"]] = cache_control
+                    else:
+                        headers.append(cache_control)
+                vary_val = b"Accept-Language"
+                if b"vary" in header_names:
+                    idx = header_names[b"vary"]
+                    existing = headers[idx][1]
+                    tokens = [p.strip() for p in existing.split(b",")]
+                    if vary_val not in tokens:
+                        headers[idx] = (b"vary", existing + b", " + vary_val)
+                else:
+                    headers.append((b"vary", vary_val))
+                message = {
+                    "type": "http.response.start",
+                    "status": message["status"],
+                    "headers": headers,
+                }
+            await send(message)
+
+        await self.app(scope, receive, send_wrapper)


 app.add_middleware(NoCacheStaticMiddleware)


+# Allowed values for config.js to prevent script injection.
+_VALID_LANGS = frozenset({"en", "ru"})
+_VALID_LOG_LEVELS = frozenset({"debug", "info", "warning", "error"})
+
+
+def _safe_js_string(value: str, allowed: frozenset[str], default: str) -> str:
+    """Return value if it is in allowed set, else default. Prevents injection in config.js."""
+    if value in allowed:
+        return value
+    return default
+
+
+# Timezone for duty display: allow only safe chars (letters, digits, /, _, -, +) to prevent injection.
+_TZ_SAFE_RE = re.compile(r"^[A-Za-z0-9_/+-]{1,50}$")
+
+
+def _safe_tz_string(value: str) -> str:
+    """Return value if it matches safe timezone pattern, else empty string."""
+    if value and _TZ_SAFE_RE.match(value.strip()):
+        return value.strip()
+    return ""
+
+
+@app.get(
+    "/app/config.js",
+    summary="Mini App config (language, log level, timezone)",
+    description=(
+        "Returns JS that sets window.__DT_LANG, window.__DT_LOG_LEVEL and window.__DT_TZ. "
+        "Loaded before main.js."
+    ),
+)
+def app_config_js() -> Response:
+    """Return JS assigning window.__DT_LANG, __DT_LOG_LEVEL and __DT_TZ for the webapp. No caching."""
+    lang = _safe_js_string(config.DEFAULT_LANGUAGE, _VALID_LANGS, "en")
+    log_level = _safe_js_string(config.LOG_LEVEL_STR.lower(), _VALID_LOG_LEVELS, "info")
+    tz = _safe_tz_string(config.DUTY_DISPLAY_TZ)
+    tz_js = f'\nwindow.__DT_TZ = "{tz}";' if tz else "\nwindow.__DT_TZ = undefined;"
+    body = (
+        f'window.__DT_LANG = "{lang}";\nwindow.__DT_LOG_LEVEL = "{log_level}";{tz_js}'
+    )
+    return Response(
+        content=body,
+        media_type="application/javascript; charset=utf-8",
+        headers={"Cache-Control": "no-store"},
+    )
+
+
@app.get(
    "/api/duties",
    response_model=list[DutyWithUser],
@@ -132,10 +221,10 @@ def get_team_calendar_ical(
 ) -> Response:
    """Return ICS calendar with all duties (event_type duty only). Token validates user."""
    if not _is_valid_calendar_token(token):
-        return Response(status_code=404, content="Not found")
+        return JSONResponse(status_code=404, content={"detail": "Not found"})
    user = get_user_by_calendar_token(session, token)
    if user is None:
-        return Response(status_code=404, content="Not found")
+        return JSONResponse(status_code=404, content={"detail": "Not found"})
    cache_key = ("team_ics",)
    ics_bytes, found = ics_calendar_cache.get(cache_key)
    if not found:
@@ -173,10 +262,10 @@ def get_personal_calendar_ical(
    No Telegram auth; access is by secret token in the URL.
    """
    if not _is_valid_calendar_token(token):
-        return Response(status_code=404, content="Not found")
+        return JSONResponse(status_code=404, content={"detail": "Not found"})
    user = get_user_by_calendar_token(session, token)
    if user is None:
-        return Response(status_code=404, content="Not found")
+        return JSONResponse(status_code=404, content={"detail": "Not found"})
    cache_key = ("personal_ics", user.id)
    ics_bytes, found = ics_calendar_cache.get(cache_key)
    if not found:
@@ -194,6 +283,6 @@ def get_personal_calendar_ical(
    )


-webapp_path = config.PROJECT_ROOT / "webapp"
+webapp_path = config.PROJECT_ROOT / "webapp-next" / "out"
 if webapp_path.is_dir():
    app.mount("/app", StaticFiles(directory=str(webapp_path), html=True), name="webapp")
--- a/duty_teller/api/dependencies.py
+++ b/duty_teller/api/dependencies.py
@@ -1,7 +1,6 @@
 """FastAPI dependencies: DB session, Miniapp auth (initData/allowlist), date validation."""

 import logging
-import re
 from typing import Annotated, Generator

 from fastapi import Depends, Header, HTTPException, Query, Request
@@ -17,42 +16,18 @@ from duty_teller.db.repository import (
 from duty_teller.db.schemas import DUTY_EVENT_TYPES, DutyWithUser
 from duty_teller.db.session import session_scope
 from duty_teller.i18n import t
-from duty_teller.i18n.lang import normalize_lang
 from duty_teller.utils.dates import DateRangeValidationError, validate_date_range

 log = logging.getLogger(__name__)

-# Extract primary language code from first Accept-Language tag (e.g. "ru-RU" -> "ru").
-_ACCEPT_LANG_CODE_RE = re.compile(r"^([a-zA-Z]{2,3})(?:-|;|,|\s|$)")
-
-
-def _parse_first_language_code(header: str | None) -> str | None:
-    """Extract the first language code from Accept-Language header.
-
-    Args:
-        header: Raw Accept-Language value (e.g. "ru-RU,ru;q=0.9,en;q=0.8").
-
-    Returns:
-        Two- or three-letter code (e.g. 'ru', 'en') or None if missing/invalid.
-    """
-    if not header or not header.strip():
-        return None
-    first = header.strip().split(",")[0].strip()
-    m = _ACCEPT_LANG_CODE_RE.match(first)
-    return m.group(1).lower() if m else None
-

 def _lang_from_accept_language(header: str | None) -> str:
-    """Normalize Accept-Language header to 'ru' or 'en'; fallback to config.DEFAULT_LANGUAGE.
+    """Return the application language: always config.DEFAULT_LANGUAGE.

-    Args:
-        header: Raw Accept-Language header value (e.g. "ru-RU,ru;q=0.9,en;q=0.8").
-
-    Returns:
-        'ru' or 'en'.
+    The header argument is kept for backward compatibility but is ignored.
+    The whole deployment uses a single language from DEFAULT_LANGUAGE.
    """
-    code = _parse_first_language_code(header)
-    return normalize_lang(code if code is not None else config.DEFAULT_LANGUAGE)
+    return config.DEFAULT_LANGUAGE


 def _auth_error_detail(auth_reason: str, lang: str) -> str:
@@ -67,7 +42,12 @@ def _validate_duty_dates(from_date: str, to_date: str, lang: str) -> None:
    try:
        validate_date_range(from_date, to_date)
    except DateRangeValidationError as e:
-        key = "dates.bad_format" if e.kind == "bad_format" else "dates.from_after_to"
+        key_map = {
+            "bad_format": "dates.bad_format",
+            "from_after_to": "dates.from_after_to",
+            "range_too_large": "dates.range_too_large",
+        }
+        key = key_map.get(e.kind, "dates.bad_format")
        raise HTTPException(status_code=400, detail=t(lang, key)) from e
    except ValueError as e:
        # Backward compatibility if something else raises ValueError.
--- a/duty_teller/api/telegram_auth.py
+++ b/duty_teller/api/telegram_auth.py
@@ -6,7 +6,7 @@ import json
 import time
 from urllib.parse import unquote

-from duty_teller.i18n.lang import normalize_lang
+import duty_teller.config as config

 # Telegram algorithm: https://core.telegram.org/bots/webapps#validating-data-received-via-the-mini-app
 # Data-check string: sorted key=value with URL-decoded values, then HMAC-SHA256(WebAppData, token) as secret.
@@ -48,12 +48,12 @@ def validate_init_data_with_reason(
    Returns:
        Tuple (telegram_user_id, username, reason, lang). reason is one of: "ok",
        "empty", "no_hash", "hash_mismatch", "auth_date_expired", "no_user",
-        "user_invalid", "no_user_id". lang is from user.language_code normalized
-        to 'ru' or 'en'; 'en' when no user. On success: (user.id, username or None,
-        "ok", lang).
+        "user_invalid", "no_user_id". lang is always config.DEFAULT_LANGUAGE.
+        On success: (user.id, username or None, "ok", lang).
    """
+    lang = config.DEFAULT_LANGUAGE
    if not init_data or not bot_token:
-        return (None, None, "empty", "en")
+        return (None, None, "empty", lang)
    init_data = init_data.strip()
    params = {}
    for part in init_data.split("&"):
@@ -65,7 +65,7 @@ def validate_init_data_with_reason(
        params[key] = value
    hash_val = params.pop("hash", None)
    if not hash_val:
-        return (None, None, "no_hash", "en")
+        return (None, None, "no_hash", lang)
    data_pairs = sorted(params.items())
    # Data-check string: key=value with URL-decoded values (per Telegram example)
    data_string = "\n".join(f"{k}={unquote(v)}" for k, v in data_pairs)
@@ -81,27 +81,26 @@ def validate_init_data_with_reason(
        digestmod=hashlib.sha256,
    ).hexdigest()
    if not hmac.compare_digest(computed.lower(), hash_val.lower()):
-        return (None, None, "hash_mismatch", "en")
+        return (None, None, "hash_mismatch", lang)
    if max_age_seconds is not None and max_age_seconds > 0:
        auth_date_raw = params.get("auth_date")
        if not auth_date_raw:
-            return (None, None, "auth_date_expired", "en")
+            return (None, None, "auth_date_expired", lang)
        try:
            auth_date = int(float(auth_date_raw))
        except (ValueError, TypeError):
-            return (None, None, "auth_date_expired", "en")
+            return (None, None, "auth_date_expired", lang)
        if time.time() - auth_date > max_age_seconds:
-            return (None, None, "auth_date_expired", "en")
+            return (None, None, "auth_date_expired", lang)
    user_raw = params.get("user")
    if not user_raw:
-        return (None, None, "no_user", "en")
+        return (None, None, "no_user", lang)
    try:
        user = json.loads(unquote(user_raw))
    except (json.JSONDecodeError, TypeError):
-        return (None, None, "user_invalid", "en")
+        return (None, None, "user_invalid", lang)
    if not isinstance(user, dict):
-        return (None, None, "user_invalid", "en")
-    lang = normalize_lang(user.get("language_code"))
+        return (None, None, "user_invalid", lang)
    raw_id = user.get("id")
    if raw_id is None:
        return (None, None, "no_user_id", lang)
--- a/duty_teller/config.py
+++ b/duty_teller/config.py
@@ -1,9 +1,11 @@
 """Load configuration from environment (e.g. .env via python-dotenv).

 BOT_TOKEN is not validated on import; call require_bot_token() in the entry point
-when running the bot.
+when running the bot. Numeric env vars (HTTP_PORT, INIT_DATA_MAX_AGE_SECONDS) use
+safe parsing with defaults on invalid values.
 """

+import logging
 import os
 import re
 from dataclasses import dataclass
@@ -15,6 +17,14 @@ from duty_teller.i18n.lang import normalize_lang

 load_dotenv()

+logger = logging.getLogger(__name__)
+
+# Valid port range for HTTP_PORT.
+HTTP_PORT_MIN, HTTP_PORT_MAX = 1, 65535
+
+# Host values treated as loopback (for health-check URL and MINI_APP_SKIP_AUTH safety).
+LOOPBACK_HTTP_HOSTS = ("127.0.0.1", "localhost", "::1", "")
+
 # Project root (parent of duty_teller package). Used for webapp path, etc.
 PROJECT_ROOT = Path(__file__).resolve().parent.parent

@@ -46,6 +56,56 @@ def _parse_phone_list(raw: str) -> set[str]:
    return result


+def _normalize_log_level(raw: str) -> str:
+    """Return a valid log level name (DEBUG, INFO, WARNING, ERROR); default INFO."""
+    level = (raw or "").strip().upper()
+    if level in ("DEBUG", "INFO", "WARNING", "ERROR"):
+        return level
+    return "INFO"
+
+
+def _parse_int_env(
+    name: str, default: int, min_val: int | None = None, max_val: int | None = None
+) -> int:
+    """Parse an integer from os.environ; use default on invalid or out-of-range. Log on fallback."""
+    raw = os.getenv(name)
+    if raw is None or raw == "":
+        return default
+    try:
+        value = int(raw.strip())
+    except ValueError:
+        logger.warning(
+            "Invalid %s=%r (expected integer); using default %s",
+            name,
+            raw,
+            default,
+        )
+        return default
+    if min_val is not None and value < min_val:
+        logger.warning(
+            "%s=%s is below minimum %s; using %s", name, value, min_val, min_val
+        )
+        return min_val
+    if max_val is not None and value > max_val:
+        logger.warning(
+            "%s=%s is above maximum %s; using %s", name, value, max_val, max_val
+        )
+        return max_val
+    return value
+
+
+def _validate_database_url(url: str) -> bool:
+    """Return True if URL looks like a supported SQLAlchemy URL (sqlite or postgres)."""
+    if not url or not isinstance(url, str):
+        return False
+    u = url.strip().split("?", 1)[0].lower()
+    return (
+        u.startswith("sqlite://")
+        or u.startswith("postgresql://")
+        or u.startswith("postgres://")
+    )
+
+
@dataclass(frozen=True)
 class Settings:
    """Injectable settings built from environment. Used in tests or when env is overridden."""
@@ -54,6 +114,7 @@ class Settings:
    database_url: str
    bot_username: str
    mini_app_base_url: str
+    mini_app_short_name: str
    http_host: str
    http_port: int
    allowed_usernames: set[str]
@@ -67,6 +128,7 @@ class Settings:
    duty_display_tz: str
    default_language: str
    duty_pin_notify: bool
+    log_level: str

    @classmethod
    def from_env(cls) -> "Settings":
@@ -95,20 +157,33 @@ class Settings:
        raw_host = (os.getenv("HTTP_HOST") or "127.0.0.1").strip()
        http_host = raw_host if raw_host else "127.0.0.1"
        bot_username = (os.getenv("BOT_USERNAME", "") or "").strip().lstrip("@").lower()
+        database_url = os.getenv("DATABASE_URL", "sqlite:///data/duty_teller.db")
+        if not _validate_database_url(database_url):
+            logger.warning(
+                "DATABASE_URL does not look like a supported URL (sqlite:// or postgresql://); "
+                "DB connection may fail."
+            )
+        http_port = _parse_int_env(
+            "HTTP_PORT", 8080, min_val=HTTP_PORT_MIN, max_val=HTTP_PORT_MAX
+        )
+        init_data_max_age = _parse_int_env("INIT_DATA_MAX_AGE_SECONDS", 0, min_val=0)
        return cls(
            bot_token=bot_token,
-            database_url=os.getenv("DATABASE_URL", "sqlite:///data/duty_teller.db"),
+            database_url=database_url,
            bot_username=bot_username,
            mini_app_base_url=os.getenv("MINI_APP_BASE_URL", "").rstrip("/"),
+            mini_app_short_name=(os.getenv("MINI_APP_SHORT_NAME", "") or "")
+            .strip()
+            .strip("/"),
            http_host=http_host,
-            http_port=int(os.getenv("HTTP_PORT", "8080")),
+            http_port=http_port,
            allowed_usernames=allowed,
            admin_usernames=admin,
            allowed_phones=allowed_phones,
            admin_phones=admin_phones,
            mini_app_skip_auth=os.getenv("MINI_APP_SKIP_AUTH", "").strip()
            in ("1", "true", "yes"),
-            init_data_max_age_seconds=int(os.getenv("INIT_DATA_MAX_AGE_SECONDS", "0")),
+            init_data_max_age_seconds=init_data_max_age,
            cors_origins=cors,
            external_calendar_ics_url=os.getenv(
                "EXTERNAL_CALENDAR_ICS_URL", ""
@@ -118,6 +193,7 @@ class Settings:
            default_language=normalize_lang(os.getenv("DEFAULT_LANGUAGE", "en")),
            duty_pin_notify=os.getenv("DUTY_PIN_NOTIFY", "1").strip().lower()
            not in ("0", "false", "no"),
+            log_level=_normalize_log_level(os.getenv("LOG_LEVEL", "INFO")),
        )


@@ -128,6 +204,7 @@ BOT_TOKEN = _settings.bot_token
 DATABASE_URL = _settings.database_url
 BOT_USERNAME = _settings.bot_username
 MINI_APP_BASE_URL = _settings.mini_app_base_url
+MINI_APP_SHORT_NAME = _settings.mini_app_short_name
 HTTP_HOST = _settings.http_host
 HTTP_PORT = _settings.http_port
 ALLOWED_USERNAMES = _settings.allowed_usernames
@@ -141,6 +218,8 @@ EXTERNAL_CALENDAR_ICS_URL = _settings.external_calendar_ics_url
 DUTY_DISPLAY_TZ = _settings.duty_display_tz
 DEFAULT_LANGUAGE = _settings.default_language
 DUTY_PIN_NOTIFY = _settings.duty_pin_notify
+LOG_LEVEL = getattr(logging, _settings.log_level.upper(), logging.INFO)
+LOG_LEVEL_STR = _settings.log_level


 def is_admin(username: str) -> bool:
--- a/duty_teller/db/repository.py
+++ b/duty_teller/db/repository.py
@@ -7,6 +7,7 @@ from datetime import datetime, timezone
 from sqlalchemy.orm import Session

 import duty_teller.config as config
+from duty_teller.db.schemas import DUTY_EVENT_TYPES
 from duty_teller.db.models import (
    User,
    Duty,
@@ -201,14 +202,19 @@ def get_or_create_user(
    return user


-def get_or_create_user_by_full_name(session: Session, full_name: str) -> User:
+def get_or_create_user_by_full_name(
+    session: Session, full_name: str, *, commit: bool = True
+) -> User:
    """Find user by exact full_name or create one (for duty-schedule import).

    New users have telegram_user_id=None and name_manually_edited=True.
+    When commit=False, caller is responsible for committing (e.g. single commit
+    per import in run_import).

    Args:
        session: DB session.
        full_name: Exact full name to match or set.
+        commit: If True, commit immediately. If False, caller commits.

    Returns:
        User instance (existing or newly created).
@@ -225,8 +231,11 @@ def get_or_create_user_by_full_name(session: Session, full_name: str) -> User:
        name_manually_edited=True,
    )
    session.add(user)
-    session.commit()
-    session.refresh(user)
+    if commit:
+        session.commit()
+        session.refresh(user)
+    else:
+        session.flush()  # Assign id so caller can use user.id before commit
    return user


@@ -447,11 +456,13 @@ def insert_duty(
        user_id: User id.
        start_at: Start time UTC, ISO 8601 with Z (e.g. 2025-01-15T09:00:00Z).
        end_at: End time UTC, ISO 8601 with Z.
-        event_type: One of "duty", "unavailable", "vacation". Default "duty".
+        event_type: One of "duty", "unavailable", "vacation". Invalid values are stored as "duty".

    Returns:
        Created Duty instance.
    """
+    if event_type not in DUTY_EVENT_TYPES:
+        event_type = "duty"
    duty = Duty(
        user_id=user_id,
        start_at=start_at,
--- a/duty_teller/handlers/commands.py
+++ b/duty_teller/handlers/commands.py
@@ -67,7 +67,8 @@ async def set_phone(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
    phone = " ".join(args).strip() if args else None
    telegram_user_id = update.effective_user.id

-    def do_set_phone() -> str | None:
+    def do_set_phone() -> tuple[str, str | None]:
+        """Returns (status, display_phone). status is 'error'|'saved'|'cleared'. display_phone for 'saved'."""
        with session_scope(config.DATABASE_URL) as session:
            full_name = build_full_name(
                update.effective_user.first_name, update.effective_user.last_name
@@ -82,16 +83,20 @@ async def set_phone(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
            )
            user = set_user_phone(session, telegram_user_id, phone or None)
            if user is None:
-                return "error"
+                return ("error", None)
            if phone:
-                return "saved"
-            return "cleared"
+                return ("saved", user.phone or config.normalize_phone(phone))
+            return ("cleared", None)

-    result = await asyncio.get_running_loop().run_in_executor(None, do_set_phone)
+    result, display_phone = await asyncio.get_running_loop().run_in_executor(
+        None, do_set_phone
+    )
    if result == "error":
        await update.message.reply_text(t(lang, "set_phone.error"))
    elif result == "saved":
-        await update.message.reply_text(t(lang, "set_phone.saved", phone=phone or ""))
+        await update.message.reply_text(
+            t(lang, "set_phone.saved", phone=display_phone or "")
+        )
    else:
        await update.message.reply_text(t(lang, "set_phone.cleared"))

--- a/duty_teller/handlers/group_duty_pin.py
+++ b/duty_teller/handlers/group_duty_pin.py
@@ -2,7 +2,8 @@

 import asyncio
 import logging
-from datetime import datetime, timezone
+import random
+from datetime import datetime, timedelta, timezone
 from typing import Literal

 import duty_teller.config as config
@@ -29,6 +30,10 @@ from duty_teller.services.group_duty_pin_service import (

 logger = logging.getLogger(__name__)

+# Per-chat locks to prevent concurrent refresh for the same chat (avoids duplicate messages).
+_refresh_locks: dict[int, asyncio.Lock] = {}
+_lock_for_refresh_locks = asyncio.Lock()
+
 JOB_NAME_PREFIX = "duty_pin_"
 RETRY_WHEN_NO_DUTY_MINUTES = 15

@@ -87,10 +92,19 @@ def _get_contact_button_markup(lang: str) -> InlineKeyboardMarkup | None:
    Uses a t.me Mini App deep link so the app opens inside Telegram. Uses url (not web_app):
    InlineKeyboardButton with web_app is allowed only in private chats, so in groups
    Telegram returns Button_type_invalid. A plain URL button works everywhere.
+
+    When MINI_APP_SHORT_NAME is set, the URL is a direct Mini App link so the app opens
+    with start_param=duty (current duty view). Otherwise the link is to the bot with
+    ?startapp=duty (user may land in bot chat; opening the app from menu does not pass
+    start_param in some clients).
    """
    if not config.BOT_USERNAME:
        return None
-    url = f"https://t.me/{config.BOT_USERNAME}?startapp=duty"
+    short = (config.MINI_APP_SHORT_NAME or "").strip().strip("/")
+    if short:
+        url = f"https://t.me/{config.BOT_USERNAME}/{short}?startapp=duty"
+    else:
+        url = f"https://t.me/{config.BOT_USERNAME}?startapp=duty"
    button = InlineKeyboardButton(
        text=t(lang, "pin_duty.view_contacts"),
        url=url,
@@ -115,8 +129,12 @@ def _sync_untrust_group(chat_id: int) -> tuple[bool, int | None]:


 async def _schedule_next_update(
-    application, chat_id: int, when_utc: datetime | None
+    application,
+    chat_id: int,
+    when_utc: datetime | None,
+    jitter_seconds: float | None = None,
 ) -> None:
+    """Schedule the next pin refresh job. Optional jitter spreads jobs when scheduling many chats."""
    job_queue = application.job_queue
    if job_queue is None:
        logger.warning("Job queue not available, cannot schedule pin update")
@@ -127,8 +145,10 @@ async def _schedule_next_update(
    if when_utc is not None:
        now_utc = datetime.now(timezone.utc).replace(tzinfo=None)
        delay = when_utc - now_utc
+        if jitter_seconds is not None and jitter_seconds > 0:
+            delay += timedelta(seconds=random.uniform(0, jitter_seconds))
        if delay.total_seconds() < 1:
-            delay = 1
+            delay = timedelta(seconds=1)
        job_queue.run_once(
            update_group_pin,
            when=delay,
@@ -137,8 +157,6 @@ async def _schedule_next_update(
        )
        logger.info("Scheduled pin update for chat_id=%s at %s", chat_id, when_utc)
    else:
-        from datetime import timedelta
-
        job_queue.run_once(
            update_group_pin,
            when=timedelta(minutes=RETRY_WHEN_NO_DUTY_MINUTES),
@@ -159,11 +177,13 @@ async def _refresh_pin_for_chat(

    Uses single DB session for message_id, text, next_shift_end (consolidated).
    If the group is no longer trusted, removes pin record, job, and message; returns "untrusted".
+    Unpin is best-effort (e.g. if user already unpinned we still pin the new message and save state).
+    Per-chat lock prevents concurrent refresh for the same chat.

    Returns:
        "updated" if the message was sent, pinned and saved successfully;
        "no_message" if there is no pin record for this chat;
-        "failed" if send_message or permissions failed;
+        "failed" if send_message or pin failed;
        "untrusted" if the group was removed from trusted list (pin record and message cleaned up).
    """
    loop = asyncio.get_running_loop()
@@ -196,42 +216,59 @@ async def _refresh_pin_for_chat(
        logger.info("No pin record for chat_id=%s, skipping update", chat_id)
        return "no_message"
    old_message_id = message_id
+
+    async with _lock_for_refresh_locks:
+        lock = _refresh_locks.setdefault(chat_id, asyncio.Lock())
    try:
-        msg = await context.bot.send_message(
-            chat_id=chat_id,
-            text=text,
-            reply_markup=_get_contact_button_markup(config.DEFAULT_LANGUAGE),
-        )
-    except (BadRequest, Forbidden) as e:
-        logger.warning(
-            "Failed to send duty message for pin refresh chat_id=%s: %s", chat_id, e
-        )
-        await _schedule_next_update(context.application, chat_id, next_end)
-        return "failed"
-    try:
-        await context.bot.unpin_chat_message(chat_id=chat_id)
-        await context.bot.pin_chat_message(
-            chat_id=chat_id,
-            message_id=msg.message_id,
-            disable_notification=not config.DUTY_PIN_NOTIFY,
-        )
-    except (BadRequest, Forbidden) as e:
-        logger.warning("Unpin or pin after refresh failed chat_id=%s: %s", chat_id, e)
-        await _schedule_next_update(context.application, chat_id, next_end)
-        return "failed"
-    await loop.run_in_executor(None, _sync_save_pin, chat_id, msg.message_id)
-    if old_message_id is not None:
-        try:
-            await context.bot.delete_message(chat_id=chat_id, message_id=old_message_id)
-        except (BadRequest, Forbidden) as e:
-            logger.warning(
-                "Could not delete old pinned message %s in chat_id=%s: %s",
-                old_message_id,
-                chat_id,
-                e,
-            )
-    await _schedule_next_update(context.application, chat_id, next_end)
-    return "updated"
+        async with lock:
+            try:
+                msg = await context.bot.send_message(
+                    chat_id=chat_id,
+                    text=text,
+                    reply_markup=_get_contact_button_markup(config.DEFAULT_LANGUAGE),
+                )
+            except (BadRequest, Forbidden) as e:
+                logger.warning(
+                    "Failed to send duty message for pin refresh chat_id=%s: %s",
+                    chat_id,
+                    e,
+                )
+                await _schedule_next_update(context.application, chat_id, next_end)
+                return "failed"
+            try:
+                await context.bot.unpin_chat_message(chat_id=chat_id)
+            except (BadRequest, Forbidden) as e:
+                logger.debug(
+                    "Unpin failed (e.g. no pinned message) chat_id=%s: %s", chat_id, e
+                )
+            try:
+                await context.bot.pin_chat_message(
+                    chat_id=chat_id,
+                    message_id=msg.message_id,
+                    disable_notification=not config.DUTY_PIN_NOTIFY,
+                )
+            except (BadRequest, Forbidden) as e:
+                logger.warning("Pin after refresh failed chat_id=%s: %s", chat_id, e)
+                await _schedule_next_update(context.application, chat_id, next_end)
+                return "failed"
+            await loop.run_in_executor(None, _sync_save_pin, chat_id, msg.message_id)
+            if old_message_id is not None:
+                try:
+                    await context.bot.delete_message(
+                        chat_id=chat_id, message_id=old_message_id
+                    )
+                except (BadRequest, Forbidden) as e:
+                    logger.warning(
+                        "Could not delete old pinned message %s in chat_id=%s: %s",
+                        old_message_id,
+                        chat_id,
+                        e,
+                    )
+            await _schedule_next_update(context.application, chat_id, next_end)
+            return "updated"
+    finally:
+        async with _lock_for_refresh_locks:
+            _refresh_locks.pop(chat_id, None)


 async def update_group_pin(context: ContextTypes.DEFAULT_TYPE) -> None:
@@ -329,12 +366,15 @@ def _get_all_pin_chat_ids_sync() -> list[int]:


 async def restore_group_pin_jobs(application) -> None:
-    """Restore scheduled pin-update jobs for all chats that have a pinned message (on startup)."""
+    """Restore scheduled pin-update jobs for all chats that have a pinned message (on startup).
+
+    Uses jitter (0–60 s) per chat to avoid thundering herd when many groups share the same shift end.
+    """
    loop = asyncio.get_running_loop()
    chat_ids = await loop.run_in_executor(None, _get_all_pin_chat_ids_sync)
    next_end = await loop.run_in_executor(None, _get_next_shift_end_sync)
    for chat_id in chat_ids:
-        await _schedule_next_update(application, chat_id, next_end)
+        await _schedule_next_update(application, chat_id, next_end, jitter_seconds=60.0)
    logger.info("Restored %s group pin jobs", len(chat_ids))


@@ -398,6 +438,8 @@ async def pin_duty_cmd(update: Update, context: ContextTypes.DEFAULT_TYPE) -> No
            message_id=message_id,
            disable_notification=True,
        )
+        next_end = await loop.run_in_executor(None, _get_next_shift_end_sync)
+        await _schedule_next_update(context.application, chat_id, next_end)
        await update.message.reply_text(t(lang, "pin_duty.pinned"))
    except (BadRequest, Forbidden) as e:
        logger.warning("pin_duty failed chat_id=%s: %s", chat_id, e)
--- a/duty_teller/handlers/import_duty_schedule.py
+++ b/duty_teller/handlers/import_duty_schedule.py
@@ -1,6 +1,7 @@
 """Import duty-schedule: /import_duty_schedule (admin only). Two steps: handover time -> JSON file."""

 import asyncio
+import logging

 import duty_teller.config as config
 from telegram import Update
@@ -16,6 +17,8 @@ from duty_teller.importers.duty_schedule import (
 from duty_teller.services.import_service import run_import
 from duty_teller.utils.handover import parse_handover_time

+logger = logging.getLogger(__name__)
+

 async def import_duty_schedule_cmd(
    update: Update, context: ContextTypes.DEFAULT_TYPE
@@ -80,9 +83,10 @@ async def handle_duty_schedule_document(
    try:
        result = parse_duty_schedule(raw)
    except DutyScheduleParseError as e:
+        logger.warning("Duty schedule parse error: %s", e, exc_info=True)
        context.user_data.pop("awaiting_duty_schedule_file", None)
        context.user_data.pop("handover_utc_time", None)
-        await update.message.reply_text(t(lang, "import.parse_error", error=str(e)))
+        await update.message.reply_text(t(lang, "import.parse_error_generic"))
        return

    def run_import_with_scope():
@@ -95,7 +99,8 @@ async def handle_duty_schedule_document(
            None, run_import_with_scope
        )
    except Exception as e:
-        await update.message.reply_text(t(lang, "import.import_error", error=str(e)))
+        logger.exception("Import failed: %s", e)
+        await update.message.reply_text(t(lang, "import.import_error_generic"))
    else:
        total = num_duty + num_unavailable + num_vacation
        unavailable_suffix = (
--- a/duty_teller/i18n/core.py
+++ b/duty_teller/i18n/core.py
@@ -1,9 +1,8 @@
-"""get_lang and t(): language from Telegram user, translate by key with fallback to en."""
+"""get_lang and t(): language from config (DEFAULT_LANGUAGE), translate by key with fallback to en."""

 from typing import TYPE_CHECKING

 import duty_teller.config as config
-from duty_teller.i18n.lang import normalize_lang
 from duty_teller.i18n.messages import MESSAGES

 if TYPE_CHECKING:
@@ -12,13 +11,12 @@ if TYPE_CHECKING:

 def get_lang(user: "User | None") -> str:
    """
-    Normalize Telegram user language to 'ru' or 'en'.
-    Uses normalize_lang for user.language_code; when user is None or has no
-    language_code, returns config.DEFAULT_LANGUAGE.
+    Return the application language: always config.DEFAULT_LANGUAGE.
+
+    The user argument is kept for backward compatibility but is ignored.
+    The whole deployment uses a single language from DEFAULT_LANGUAGE.
    """
-    if user is None or not getattr(user, "language_code", None):
-        return config.DEFAULT_LANGUAGE
-    return normalize_lang(user.language_code)
+    return config.DEFAULT_LANGUAGE


 def t(lang: str, key: str, **kwargs: str) -> str:
--- a/duty_teller/i18n/messages.py
+++ b/duty_teller/i18n/messages.py
@@ -72,7 +72,9 @@ MESSAGES: dict[str, dict[str, str]] = {
        "import.send_json": "Send the duty-schedule file (JSON).",
        "import.need_json": "File must have .json extension.",
        "import.parse_error": "File parse error: {error}",
+        "import.parse_error_generic": "The file could not be parsed. Check the format and try again.",
        "import.import_error": "Import error: {error}",
+        "import.import_error_generic": "Import failed. Please try again or contact an administrator.",
        "import.done": (
            "Import done: {users} users, {duties} duties{unavailable}{vacation} "
            "({total} events total)."
@@ -88,6 +90,7 @@ MESSAGES: dict[str, dict[str, str]] = {
        "api.access_denied": "Access denied",
        "dates.bad_format": "Parameters from and to must be in YYYY-MM-DD format",
        "dates.from_after_to": "from date must not be after to",
+        "dates.range_too_large": "Date range is too large. Request a shorter period.",
        "contact.show": "Contacts",
        "contact.back": "Back",
        "current_duty.title": "Current Duty",
@@ -160,7 +163,9 @@ MESSAGES: dict[str, dict[str, str]] = {
        "import.send_json": "Отправьте файл в формате duty-schedule (JSON).",
        "import.need_json": "Нужен файл с расширением .json",
        "import.parse_error": "Ошибка разбора файла: {error}",
+        "import.parse_error_generic": "Не удалось разобрать файл. Проверьте формат и попробуйте снова.",
        "import.import_error": "Ошибка импорта: {error}",
+        "import.import_error_generic": "Импорт не выполнен. Попробуйте снова или обратитесь к администратору.",
        "import.done": "Импорт выполнен: {users} пользователей, {duties} дежурств{unavailable}{vacation} (всего {total} событий).",
        "import.done_unavailable": ", {count} недоступностей",
        "import.done_vacation": ", {count} отпусков",
@@ -171,6 +176,7 @@ MESSAGES: dict[str, dict[str, str]] = {
        "api.access_denied": "Доступ запрещён",
        "dates.bad_format": "Параметры from и to должны быть в формате YYYY-MM-DD",
        "dates.from_after_to": "Дата from не должна быть позже to",
+        "dates.range_too_large": "Диапазон дат слишком большой. Запросите более короткий период.",
        "contact.show": "Контакты",
        "contact.back": "Назад",
        "current_duty.title": "Текущее дежурство",
--- a/duty_teller/importers/duty_schedule.py
+++ b/duty_teller/importers/duty_schedule.py
@@ -9,6 +9,11 @@ DUTY_MARKERS = frozenset({"б", "Б", "в", "В"})
 UNAVAILABLE_MARKER = "Н"
 VACATION_MARKER = "О"

+# Limits to avoid abuse and unreasonable input.
+MAX_SCHEDULE_ROWS = 500
+MAX_FULL_NAME_LENGTH = 200
+MAX_DUTY_STRING_LENGTH = 10000
+

@dataclass
 class DutyScheduleEntry:
@@ -69,10 +74,24 @@ def parse_duty_schedule(raw_bytes: bytes) -> DutyScheduleResult:
    except ValueError as e:
        raise DutyScheduleParseError(f"Invalid meta.start_date: {start_str}") from e

+    # Reject dates outside current year ± 1.
+    today = date.today()
+    min_year = today.year - 1
+    max_year = today.year + 1
+    if not (min_year <= start_date.year <= max_year):
+        raise DutyScheduleParseError(
+            f"meta.start_date year must be between {min_year} and {max_year}"
+        )
+
    schedule = data.get("schedule")
    if not isinstance(schedule, list):
        raise DutyScheduleParseError("Missing or invalid 'schedule' (must be array)")

+    if len(schedule) > MAX_SCHEDULE_ROWS:
+        raise DutyScheduleParseError(
+            f"schedule has too many rows (max {MAX_SCHEDULE_ROWS})"
+        )
+
    max_days = 0
    entries: list[DutyScheduleEntry] = []

@@ -85,12 +104,20 @@ def parse_duty_schedule(raw_bytes: bytes) -> DutyScheduleResult:
        full_name = name.strip()
        if not full_name:
            raise DutyScheduleParseError("schedule item 'name' cannot be empty")
+        if len(full_name) > MAX_FULL_NAME_LENGTH:
+            raise DutyScheduleParseError(
+                f"schedule item 'name' must not exceed {MAX_FULL_NAME_LENGTH} characters"
+            )

        duty_str = row.get("duty")
        if duty_str is None:
            duty_str = ""
        if not isinstance(duty_str, str):
            raise DutyScheduleParseError("schedule item 'duty' must be string")
+        if len(duty_str) > MAX_DUTY_STRING_LENGTH:
+            raise DutyScheduleParseError(
+                f"schedule item 'duty' must not exceed {MAX_DUTY_STRING_LENGTH} characters"
+            )

        cells = [c.strip() for c in duty_str.split(";")]
        max_days = max(max_days, len(cells))
@@ -120,4 +147,9 @@ def parse_duty_schedule(raw_bytes: bytes) -> DutyScheduleResult:
    else:
        end_date = start_date + timedelta(days=max_days - 1)

+    if not (min_year <= end_date.year <= max_year):
+        raise DutyScheduleParseError(
+            f"Computed end_date year must be between {min_year} and {max_year}"
+        )
+
    return DutyScheduleResult(start_date=start_date, end_date=end_date, entries=entries)
--- a/duty_teller/run.py
+++ b/duty_teller/run.py
@@ -3,7 +3,9 @@
 import asyncio
 import json
 import logging
+import sys
 import threading
+import time
 import urllib.request

 from telegram.ext import ApplicationBuilder
@@ -13,6 +15,9 @@ from duty_teller.config import require_bot_token
 from duty_teller.handlers import group_duty_pin, register_handlers
 from duty_teller.utils.http_client import safe_urlopen

+# Seconds to wait for HTTP server to bind before health check.
+_HTTP_STARTUP_WAIT_SEC = 3
+

 async def _resolve_bot_username(application) -> None:
    """If BOT_USERNAME is not set from env, resolve it via get_me()."""
@@ -24,7 +29,7 @@ async def _resolve_bot_username(application) -> None:

 logging.basicConfig(
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
-    level=logging.INFO,
+    level=config.LOG_LEVEL,
 )
 logger = logging.getLogger(__name__)

@@ -69,6 +74,25 @@ def _run_uvicorn(web_app, port: int) -> None:
    loop.run_until_complete(server.serve())


+def _wait_for_http_ready(port: int) -> bool:
+    """Return True if /health responds successfully within _HTTP_STARTUP_WAIT_SEC."""
+    host = config.HTTP_HOST
+    if host not in config.LOOPBACK_HTTP_HOSTS:
+        host = "127.0.0.1"
+    url = f"http://{host}:{port}/health"
+    deadline = time.monotonic() + _HTTP_STARTUP_WAIT_SEC
+    while time.monotonic() < deadline:
+        try:
+            req = urllib.request.Request(url)
+            with safe_urlopen(req, timeout=2) as resp:
+                if resp.status == 200:
+                    return True
+        except Exception as e:
+            logger.debug("Health check not ready yet: %s", e)
+        time.sleep(0.5)
+    return False
+
+
 def main() -> None:
    """Build the bot and FastAPI, start uvicorn in a thread, run polling."""
    require_bot_token()
@@ -85,16 +109,30 @@ def main() -> None:

    from duty_teller.api.app import app as web_app

-    t = threading.Thread(
-        target=_run_uvicorn,
-        args=(web_app, config.HTTP_PORT),
-        daemon=True,
-    )
-    t.start()
-
    if config.MINI_APP_SKIP_AUTH:
        logger.warning(
            "MINI_APP_SKIP_AUTH is set — API auth disabled (insecure); use only for dev"
        )
+        if config.HTTP_HOST not in config.LOOPBACK_HTTP_HOSTS:
+            print(
+                "ERROR: MINI_APP_SKIP_AUTH must not be used in production (non-localhost).",
+                file=sys.stderr,
+            )
+            sys.exit(1)
+
+    t = threading.Thread(
+        target=_run_uvicorn,
+        args=(web_app, config.HTTP_PORT),
+        daemon=False,
+    )
+    t.start()
+
+    if not _wait_for_http_ready(config.HTTP_PORT):
+        logger.error(
+            "HTTP server did not become ready on port %s within %s s; check port and permissions.",
+            config.HTTP_PORT,
+            _HTTP_STARTUP_WAIT_SEC,
+        )
+        sys.exit(1)
    logger.info("Bot starting (polling)... HTTP API on port %s", config.HTTP_PORT)
    app.run_polling(allowed_updates=["message", "my_chat_member"])
--- a/duty_teller/services/import_service.py
+++ b/duty_teller/services/import_service.py
@@ -1,5 +1,6 @@
 """Import duty schedule: delete range, insert duties/unavailable/vacation. Accepts session."""

+import logging
 from datetime import date, timedelta

 from sqlalchemy.orm import Session
@@ -14,6 +15,8 @@ from duty_teller.db.repository import (
 from duty_teller.importers.duty_schedule import DutyScheduleResult
 from duty_teller.utils.dates import day_start_iso, day_end_iso, duty_to_iso

+logger = logging.getLogger(__name__)
+

 def _consecutive_date_ranges(dates: list[date]) -> list[tuple[date, date]]:
    """Sort dates and merge consecutive ones into (first, last) ranges. Empty list -> []."""
@@ -53,16 +56,24 @@ def run_import(
    Returns:
        Tuple (num_users, num_duty, num_unavailable, num_vacation).
    """
+    logger.info(
+        "Import started: range %s..%s, %d entries",
+        result.start_date,
+        result.end_date,
+        len(result.entries),
+    )
    from_date_str = result.start_date.isoformat()
    to_date_str = result.end_date.isoformat()
    num_duty = num_unavailable = num_vacation = 0

-    # Batch: get all users by full_name, create missing
+    # Batch: get all users by full_name, create missing (no commit until end)
    names = [e.full_name for e in result.entries]
    users_map = get_users_by_full_names(session, names)
    for name in names:
        if name not in users_map:
-            users_map[name] = get_or_create_user_by_full_name(session, name)
+            users_map[name] = get_or_create_user_by_full_name(
+                session, name, commit=False
+            )

    # Delete range per user (no commit)
    for entry in result.entries:
@@ -113,4 +124,11 @@ def run_import(
        session.bulk_insert_mappings(Duty, duty_rows)
    session.commit()
    invalidate_duty_related_caches()
+    logger.info(
+        "Import done: %d users, %d duty, %d unavailable, %d vacation",
+        len(result.entries),
+        num_duty,
+        num_unavailable,
+        num_vacation,
+    )
    return (len(result.entries), num_duty, num_unavailable, num_vacation)
--- a/duty_teller/utils/dates.py
+++ b/duty_teller/utils/dates.py
@@ -24,10 +24,17 @@ def duty_to_iso(d: date, hour_utc: int, minute_utc: int) -> str:
 _ISO_DATE_RE = re.compile(r"^\d{4}-\d{2}-\d{2}$")


+# Maximum allowed date range in days (e.g. 731 = 2 years).
+MAX_DATE_RANGE_DAYS = 731
+
+
 class DateRangeValidationError(ValueError):
    """Raised when from_date/to_date validation fails. API uses kind for i18n key."""

-    def __init__(self, kind: Literal["bad_format", "from_after_to"]) -> None:
+    def __init__(
+        self,
+        kind: Literal["bad_format", "from_after_to", "range_too_large"],
+    ) -> None:
        self.kind = kind
        super().__init__(kind)

@@ -86,12 +93,20 @@ def parse_iso_date(s: str) -> date | None:


 def validate_date_range(from_date: str, to_date: str) -> None:
-    """Validate from_date and to_date are YYYY-MM-DD and from_date <= to_date.
+    """Validate from_date and to_date are YYYY-MM-DD, from_date <= to_date, and range <= MAX_DATE_RANGE_DAYS.

    Raises:
-        DateRangeValidationError: bad_format if format invalid, from_after_to if from > to.
+        DateRangeValidationError: bad_format if format invalid, from_after_to if from > to,
+            range_too_large if (to_date - from_date) > MAX_DATE_RANGE_DAYS.
    """
    if not _ISO_DATE_RE.match(from_date or "") or not _ISO_DATE_RE.match(to_date or ""):
        raise DateRangeValidationError("bad_format")
    if from_date > to_date:
        raise DateRangeValidationError("from_after_to")
+    try:
+        from_d = date.fromisoformat(from_date)
+        to_d = date.fromisoformat(to_date)
+    except ValueError:
+        raise DateRangeValidationError("bad_format") from None
+    if (to_d - from_d).days > MAX_DATE_RANGE_DAYS:
+        raise DateRangeValidationError("range_too_large")
--- a/tests/test_api_dependencies.py
+++ b/tests/test_api_dependencies.py
@@ -10,24 +10,29 @@ import duty_teller.config as config


 class TestLangFromAcceptLanguage:
-    """Tests for _lang_from_accept_language."""
+    """Tests for _lang_from_accept_language: always returns config.DEFAULT_LANGUAGE."""

-    def test_none_returns_default(self):
+    def test_always_returns_default_language(self):
+        """Header is ignored; result is always config.DEFAULT_LANGUAGE."""
        assert deps._lang_from_accept_language(None) == config.DEFAULT_LANGUAGE
-
-    def test_empty_string_returns_default(self):
        assert deps._lang_from_accept_language("") == config.DEFAULT_LANGUAGE
        assert deps._lang_from_accept_language("   ") == config.DEFAULT_LANGUAGE
+        assert (
+            deps._lang_from_accept_language("ru-RU,ru;q=0.9") == config.DEFAULT_LANGUAGE
+        )
+        assert deps._lang_from_accept_language("en-US") == config.DEFAULT_LANGUAGE
+        assert deps._lang_from_accept_language("zz") == config.DEFAULT_LANGUAGE
+        assert deps._lang_from_accept_language("x") == config.DEFAULT_LANGUAGE

-    def test_ru_ru_returns_ru(self):
-        assert deps._lang_from_accept_language("ru-RU,ru;q=0.9") == "ru"
+    def test_returns_ru_when_default_language_is_ru(self):
+        with patch.object(config, "DEFAULT_LANGUAGE", "ru"):
+            assert deps._lang_from_accept_language("en-US") == "ru"
+            assert deps._lang_from_accept_language(None) == "ru"

-    def test_en_us_returns_en(self):
-        assert deps._lang_from_accept_language("en-US") == "en"
-
-    def test_invalid_fallback_to_en(self):
-        assert deps._lang_from_accept_language("zz") == "en"
-        assert deps._lang_from_accept_language("x") == "en"
+    def test_returns_en_when_default_language_is_en(self):
+        with patch.object(config, "DEFAULT_LANGUAGE", "en"):
+            assert deps._lang_from_accept_language("ru-RU") == "en"
+            assert deps._lang_from_accept_language(None) == "en"


 class TestAuthErrorDetail:
--- a/tests/test_app.py
+++ b/tests/test_app.py
@@ -23,6 +23,80 @@ def test_health(client):
    assert r.json() == {"status": "ok"}


+def test_unhandled_exception_returns_500_json(client):
+    """Global exception handler returns 500 JSON without leaking exception details."""
+    from unittest.mock import MagicMock
+
+    from duty_teller.api.app import global_exception_handler
+
+    # Call the registered handler directly: it returns JSON and does not expose str(exc).
+    request = MagicMock()
+    exc = RuntimeError("internal failure")
+    response = global_exception_handler(request, exc)
+    assert response.status_code == 500
+    assert response.body.decode() == '{"detail":"Internal server error"}'
+    assert "internal failure" not in response.body.decode()
+
+
+def test_health_has_vary_accept_language(client):
+    """NoCacheStaticMiddleware adds Vary: Accept-Language to all responses."""
+    r = client.get("/health")
+    assert r.status_code == 200
+    assert "accept-language" in r.headers.get("vary", "").lower()
+
+
+def test_app_static_has_no_store_and_vary(client):
+    """Static files under /app get Cache-Control: no-store and Vary: Accept-Language."""
+    r = client.get("/app/")
+    if r.status_code != 200:
+        r = client.get("/app")
+    assert r.status_code == 200, (
+        "webapp static mount should serve index at /app or /app/"
+    )
+    assert r.headers.get("cache-control") == "no-store"
+    assert "accept-language" in r.headers.get("vary", "").lower()
+
+
+def test_app_js_has_no_store(client):
+    """JS and all static under /app get Cache-Control: no-store."""
+    webapp_out = config.PROJECT_ROOT / "webapp-next" / "out"
+    if not webapp_out.is_dir():
+        pytest.skip("webapp-next/out not built")
+    # Next.js static export serves JS under _next/static/chunks/<hash>.js
+    js_files = list(webapp_out.glob("_next/static/chunks/*.js"))
+    if not js_files:
+        pytest.skip("no JS chunks in webapp-next/out")
+    rel = js_files[0].relative_to(webapp_out)
+    r = client.get(f"/app/{rel.as_posix()}")
+    assert r.status_code == 200
+    assert r.headers.get("cache-control") == "no-store"
+
+
+def test_app_config_js_returns_lang_from_default_language(client):
+    """GET /app/config.js returns JS setting window.__DT_LANG from config.DEFAULT_LANGUAGE."""
+    r = client.get("/app/config.js")
+    assert r.status_code == 200
+    assert r.headers.get("content-type", "").startswith("application/javascript")
+    assert r.headers.get("cache-control") == "no-store"
+    body = r.text
+    assert "window.__DT_LANG" in body
+    assert config.DEFAULT_LANGUAGE in body
+
+
+@patch("duty_teller.api.app.config.DEFAULT_LANGUAGE", '"; alert(1); "')
+@patch("duty_teller.api.app.config.LOG_LEVEL_STR", "DEBUG\x00INJECT")
+def test_app_config_js_sanitizes_lang_and_log_level(client):
+    """config.js uses whitelist: invalid lang/log_level produce safe defaults, no script injection."""
+    r = client.get("/app/config.js")
+    assert r.status_code == 200
+    body = r.text
+    # Must be valid JS and not contain the raw malicious strings.
+    assert 'window.__DT_LANG = "en"' in body or 'window.__DT_LANG = "ru"' in body
+    assert "alert" not in body
+    assert "INJECT" not in body
+    assert "window.__DT_LOG_LEVEL" in body
+
+
 def test_duties_invalid_date_format(client):
    r = client.get("/api/duties", params={"from": "2025-01-01", "to": "invalid"})
    assert r.status_code == 400
@@ -37,6 +111,30 @@ def test_duties_from_after_to(client):
    assert "from" in detail or "to" in detail or "after" in detail or "позже" in detail


+@patch("duty_teller.api.app.config.MINI_APP_SKIP_AUTH", True)
+def test_duties_range_too_large_400(client):
+    """Date range longer than MAX_DATE_RANGE_DAYS returns 400 with dates.range_too_large message."""
+    from datetime import date, timedelta
+
+    from duty_teller.utils.dates import MAX_DATE_RANGE_DAYS
+
+    from_d = date(2020, 1, 1)
+    to_d = from_d + timedelta(days=MAX_DATE_RANGE_DAYS + 1)
+    r = client.get(
+        "/api/duties",
+        params={"from": from_d.isoformat(), "to": to_d.isoformat()},
+    )
+    assert r.status_code == 400
+    detail = r.json()["detail"]
+    # EN: "Date range is too large. Request a shorter period." / RU: "Диапазон дат слишком большой..."
+    assert (
+        "range" in detail.lower()
+        or "short" in detail.lower()
+        or "короткий" in detail
+        or "большой" in detail
+    )
+
+
@patch("duty_teller.api.dependencies.config.MINI_APP_SKIP_AUTH", False)
 def test_duties_403_without_init_data(client):
    """Without X-Telegram-Init-Data and without MINI_APP_SKIP_AUTH → 403 (any client)."""
@@ -272,20 +370,21 @@ def test_duties_200_with_unknown_event_type_mapped_to_duty(client):


 def test_calendar_ical_team_404_invalid_token_format(client):
-    """GET /api/calendar/ical/team/{token}.ics with invalid token format returns 404 without DB."""
+    """GET /api/calendar/ical/team/{token}.ics with invalid token format returns 404 JSON."""
    r = client.get("/api/calendar/ical/team/short.ics")
    assert r.status_code == 404
-    assert "not found" in r.text.lower()
+    assert r.headers.get("content-type", "").startswith("application/json")
+    assert r.json() == {"detail": "Not found"}


@patch("duty_teller.api.app.get_user_by_calendar_token")
 def test_calendar_ical_team_404_unknown_token(mock_get_user, client):
-    """GET /api/calendar/ical/team/{token}.ics with unknown token returns 404."""
+    """GET /api/calendar/ical/team/{token}.ics with unknown token returns 404 JSON."""
    mock_get_user.return_value = None
    valid_format_token = "B" * 43
    r = client.get(f"/api/calendar/ical/team/{valid_format_token}.ics")
    assert r.status_code == 404
-    assert "not found" in r.text.lower()
+    assert r.json() == {"detail": "Not found"}
    mock_get_user.assert_called_once()


@@ -337,11 +436,10 @@ def test_calendar_ical_team_200_only_duty_and_description(


 def test_calendar_ical_404_invalid_token_format(client):
-    """GET /api/calendar/ical/{token}.ics with invalid token format returns 404 without DB call."""
-    # Token format must be base64url, 40–50 chars; short or invalid chars → 404
+    """GET /api/calendar/ical/{token}.ics with invalid token format returns 404 JSON."""
    r = client.get("/api/calendar/ical/short.ics")
    assert r.status_code == 404
-    assert "not found" in r.text.lower()
+    assert r.json() == {"detail": "Not found"}
    r2 = client.get("/api/calendar/ical/" + "x" * 60 + ".ics")
    assert r2.status_code == 404
    r3 = client.get("/api/calendar/ical/../../../etc/passwd.ics")
@@ -350,13 +448,12 @@ def test_calendar_ical_404_invalid_token_format(client):

@patch("duty_teller.api.app.get_user_by_calendar_token")
 def test_calendar_ical_404_unknown_token(mock_get_user, client):
-    """GET /api/calendar/ical/{token}.ics with unknown token returns 404."""
+    """GET /api/calendar/ical/{token}.ics with unknown token returns 404 JSON."""
    mock_get_user.return_value = None
-    # Use a token that passes format validation (base64url, 40–50 chars)
    valid_format_token = "A" * 43
    r = client.get(f"/api/calendar/ical/{valid_format_token}.ics")
    assert r.status_code == 404
-    assert "not found" in r.text.lower()
+    assert r.json() == {"detail": "Not found"}
    mock_get_user.assert_called_once()


--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -91,3 +91,29 @@ def test_require_bot_token_does_not_raise_when_set(monkeypatch):
    """require_bot_token() does nothing when BOT_TOKEN is set."""
    monkeypatch.setattr(config, "BOT_TOKEN", "123:ABC")
    config.require_bot_token()
+
+
+def test_settings_from_env_invalid_http_port_uses_default(monkeypatch):
+    """Invalid HTTP_PORT (non-numeric or out of range) yields default or clamped value."""
+    monkeypatch.delenv("HTTP_PORT", raising=False)
+    settings = config.Settings.from_env()
+    assert 1 <= settings.http_port <= 65535
+
+    monkeypatch.setenv("HTTP_PORT", "not-a-number")
+    settings = config.Settings.from_env()
+    assert settings.http_port == 8080
+
+    monkeypatch.setenv("HTTP_PORT", "0")
+    settings = config.Settings.from_env()
+    assert settings.http_port == 1
+
+    monkeypatch.setenv("HTTP_PORT", "99999")
+    settings = config.Settings.from_env()
+    assert settings.http_port == 65535
+
+
+def test_settings_from_env_invalid_init_data_max_age_uses_default(monkeypatch):
+    """Invalid INIT_DATA_MAX_AGE_SECONDS yields default 0."""
+    monkeypatch.setenv("INIT_DATA_MAX_AGE_SECONDS", "invalid")
+    settings = config.Settings.from_env()
+    assert settings.init_data_max_age_seconds == 0
--- a/tests/test_duty_schedule_parser.py
+++ b/tests/test_duty_schedule_parser.py
@@ -1,11 +1,14 @@
 """Tests for duty-schedule JSON parser."""

+import json
 from datetime import date

 import pytest

 from duty_teller.importers.duty_schedule import (
    DUTY_MARKERS,
+    MAX_FULL_NAME_LENGTH,
+    MAX_SCHEDULE_ROWS,
    UNAVAILABLE_MARKER,
    VACATION_MARKER,
    DutyScheduleParseError,
@@ -118,3 +121,38 @@ def test_unavailable_and_vacation_markers():
    assert entry.unavailable_dates == [date(2026, 2, 1)]
    assert entry.vacation_dates == [date(2026, 2, 2)]
    assert entry.duty_dates == [date(2026, 2, 3)]
+
+
+def test_parse_start_date_year_out_of_range():
+    """start_date year must be current ± 1; otherwise DutyScheduleParseError."""
+    # Use a year far in the past/future so it fails regardless of test run date.
+    raw_future = b'{"meta": {"start_date": "2030-01-01"}, "schedule": [{"name": "A", "duty": ""}]}'
+    with pytest.raises(DutyScheduleParseError, match="year|2030"):
+        parse_duty_schedule(raw_future)
+    raw_past = b'{"meta": {"start_date": "2019-01-01"}, "schedule": [{"name": "A", "duty": ""}]}'
+    with pytest.raises(DutyScheduleParseError, match="year|2019"):
+        parse_duty_schedule(raw_past)
+
+
+def test_parse_too_many_schedule_rows():
+    """More than MAX_SCHEDULE_ROWS rows raises DutyScheduleParseError."""
+    rows = [{"name": f"User {i}", "duty": ""} for i in range(MAX_SCHEDULE_ROWS + 1)]
+    today = date.today()
+    start = today.replace(month=1, day=1)
+    payload = {"meta": {"start_date": start.isoformat()}, "schedule": rows}
+    raw = json.dumps(payload).encode("utf-8")
+    with pytest.raises(DutyScheduleParseError, match="too many|max"):
+        parse_duty_schedule(raw)
+
+
+def test_parse_full_name_too_long():
+    """full_name longer than MAX_FULL_NAME_LENGTH raises DutyScheduleParseError."""
+    long_name = "A" * (MAX_FULL_NAME_LENGTH + 1)
+    today = date.today()
+    start = today.replace(month=1, day=1)
+    raw = (
+        f'{{"meta": {{"start_date": "{start.isoformat()}"}}, '
+        f'"schedule": [{{"name": "{long_name}", "duty": ""}}]}}'
+    ).encode("utf-8")
+    with pytest.raises(DutyScheduleParseError, match="exceed|character"):
+        parse_duty_schedule(raw)
--- a/tests/test_handlers_group_duty_pin.py
+++ b/tests/test_handlers_group_duty_pin.py
@@ -90,10 +90,13 @@ def test_get_contact_button_markup_empty_username_returns_none():


 def test_get_contact_button_markup_returns_markup_when_username_set():
-    """_get_contact_button_markup: BOT_USERNAME set -> returns InlineKeyboardMarkup with t.me deep link (startapp=duty)."""
+    """_get_contact_button_markup: BOT_USERNAME set, no short name -> t.me bot link with startapp=duty."""
    from telegram import InlineKeyboardMarkup

-    with patch.object(config, "BOT_USERNAME", "MyDutyBot"):
+    with (
+        patch.object(config, "BOT_USERNAME", "MyDutyBot"),
+        patch.object(config, "MINI_APP_SHORT_NAME", ""),
+    ):
        with patch.object(mod, "t", return_value="View contacts"):
            result = mod._get_contact_button_markup("en")
    assert result is not None
@@ -107,6 +110,22 @@ def test_get_contact_button_markup_returns_markup_when_username_set():
    assert btn.url == "https://t.me/MyDutyBot?startapp=duty"


+def test_get_contact_button_markup_with_short_name_uses_direct_miniapp_link():
+    """_get_contact_button_markup: MINI_APP_SHORT_NAME set -> direct Mini App URL with startapp=duty."""
+    from telegram import InlineKeyboardMarkup
+
+    with (
+        patch.object(config, "BOT_USERNAME", "MyDutyBot"),
+        patch.object(config, "MINI_APP_SHORT_NAME", "DutyApp"),
+    ):
+        with patch.object(mod, "t", return_value="View contacts"):
+            result = mod._get_contact_button_markup("en")
+    assert result is not None
+    assert isinstance(result, InlineKeyboardMarkup)
+    btn = result.inline_keyboard[0][0]
+    assert btn.url == "https://t.me/MyDutyBot/DutyApp?startapp=duty"
+
+
@pytest.mark.asyncio
 async def test_schedule_next_update_job_queue_none_returns_early():
    """_schedule_next_update: job_queue is None -> log and return, no run_once."""
@@ -277,8 +296,8 @@ async def test_update_group_pin_send_raises_no_unpin_pin_schedule_still_called()


@pytest.mark.asyncio
-async def test_update_group_pin_repin_raises_still_schedules_next():
-    """update_group_pin: send_message ok, unpin or pin raises -> no _sync_save_pin, schedule still called, log."""
+async def test_update_group_pin_unpin_raises_pin_succeeds_saves_and_schedules():
+    """update_group_pin: send_message ok, unpin raises (e.g. no pinned message), pin succeeds -> save_pin and schedule called."""
    new_msg = MagicMock()
    new_msg.message_id = 888
    context = MagicMock()
@@ -287,9 +306,45 @@ async def test_update_group_pin_repin_raises_still_schedules_next():
    context.bot = MagicMock()
    context.bot.send_message = AsyncMock(return_value=new_msg)
    context.bot.unpin_chat_message = AsyncMock(
-        side_effect=Forbidden("Not enough rights")
+        side_effect=BadRequest("Chat has no pinned message")
    )
    context.bot.pin_chat_message = AsyncMock()
+    context.bot.delete_message = AsyncMock()
+    context.application = MagicMock()
+
+    with patch.object(config, "DUTY_PIN_NOTIFY", True):
+        with patch.object(mod, "_sync_is_trusted", return_value=True):
+            with patch.object(
+                mod, "_sync_get_pin_refresh_data", return_value=(3, "Text", None)
+            ):
+                with patch.object(
+                    mod, "_schedule_next_update", AsyncMock()
+                ) as mock_schedule:
+                    with patch.object(mod, "_sync_save_pin") as mock_save:
+                        await mod.update_group_pin(context)
+    context.bot.send_message.assert_called_once_with(
+        chat_id=222, text="Text", reply_markup=None
+    )
+    context.bot.unpin_chat_message.assert_called_once_with(chat_id=222)
+    context.bot.pin_chat_message.assert_called_once_with(
+        chat_id=222, message_id=888, disable_notification=False
+    )
+    mock_save.assert_called_once_with(222, 888)
+    mock_schedule.assert_called_once_with(context.application, 222, None)
+
+
+@pytest.mark.asyncio
+async def test_update_group_pin_pin_raises_no_save_still_schedules_next():
+    """update_group_pin: send_message ok, unpin ok, pin raises -> no _sync_save_pin, schedule still called, log."""
+    new_msg = MagicMock()
+    new_msg.message_id = 888
+    context = MagicMock()
+    context.job = MagicMock()
+    context.job.data = {"chat_id": 222}
+    context.bot = MagicMock()
+    context.bot.send_message = AsyncMock(return_value=new_msg)
+    context.bot.unpin_chat_message = AsyncMock()
+    context.bot.pin_chat_message = AsyncMock(side_effect=Forbidden("Not enough rights"))
    context.application = MagicMock()

    with patch.object(config, "DUTY_PIN_NOTIFY", True):
@@ -308,7 +363,7 @@ async def test_update_group_pin_repin_raises_still_schedules_next():
    )
    mock_save.assert_not_called()
    mock_logger.warning.assert_called_once()
-    assert "Unpin or pin" in mock_logger.warning.call_args[0][0]
+    assert "Pin after refresh failed" in mock_logger.warning.call_args[0][0]
    mock_schedule.assert_called_once_with(context.application, 222, None)


@@ -371,7 +426,7 @@ async def test_pin_duty_cmd_group_only_reply():

@pytest.mark.asyncio
 async def test_pin_duty_cmd_group_pins_and_replies_pinned():
-    """pin_duty_cmd in group with existing pin record -> pin and reply pinned."""
+    """pin_duty_cmd in group with existing pin record -> pin, schedule next update, reply pinned."""
    update = MagicMock()
    update.message = MagicMock()
    update.message.reply_text = AsyncMock()
@@ -382,16 +437,22 @@ async def test_pin_duty_cmd_group_pins_and_replies_pinned():
    context = MagicMock()
    context.bot = MagicMock()
    context.bot.pin_chat_message = AsyncMock()
+    context.application = MagicMock()

    with patch("duty_teller.handlers.group_duty_pin.get_lang", return_value="en"):
        with patch.object(mod, "_sync_is_trusted", return_value=True):
            with patch.object(mod, "_sync_get_message_id", return_value=5):
-                with patch("duty_teller.handlers.group_duty_pin.t") as mock_t:
-                    mock_t.return_value = "Pinned"
-                    await mod.pin_duty_cmd(update, context)
+                with patch.object(mod, "_get_next_shift_end_sync", return_value=None):
+                    with patch.object(
+                        mod, "_schedule_next_update", AsyncMock()
+                    ) as mock_schedule:
+                        with patch("duty_teller.handlers.group_duty_pin.t") as mock_t:
+                            mock_t.return_value = "Pinned"
+                            await mod.pin_duty_cmd(update, context)
    context.bot.pin_chat_message.assert_called_once_with(
        chat_id=100, message_id=5, disable_notification=True
    )
+    mock_schedule.assert_called_once_with(context.application, 100, None)
    update.message.reply_text.assert_called_once_with("Pinned")


@@ -891,8 +952,8 @@ async def test_my_chat_member_handler_bot_removed_deletes_pin_and_jobs():


@pytest.mark.asyncio
-async def test_restore_group_pin_jobs_calls_schedule_for_each_chat():
-    """restore_group_pin_jobs: for each chat_id from _get_all_pin_chat_ids_sync, calls _schedule_next_update."""
+async def test_restore_group_pin_jobs_calls_schedule_for_each_chat_with_jitter():
+    """restore_group_pin_jobs: for each chat_id calls _schedule_next_update with jitter_seconds=60."""
    application = MagicMock()
    application.job_queue = MagicMock()
    application.job_queue.get_jobs_by_name = MagicMock(return_value=[])
@@ -905,8 +966,8 @@ async def test_restore_group_pin_jobs_calls_schedule_for_each_chat():
            ) as mock_schedule:
                await mod.restore_group_pin_jobs(application)
    assert mock_schedule.call_count == 2
-    mock_schedule.assert_any_call(application, 10, None)
-    mock_schedule.assert_any_call(application, 20, None)
+    mock_schedule.assert_any_call(application, 10, None, jitter_seconds=60.0)
+    mock_schedule.assert_any_call(application, 20, None, jitter_seconds=60.0)


 # --- _refresh_pin_for_chat untrusted ---
--- a/tests/test_handlers_import_duty_schedule.py
+++ b/tests/test_handlers_import_duty_schedule.py
@@ -278,8 +278,8 @@ async def test_handle_duty_schedule_document_non_json_replies_need_json():


@pytest.mark.asyncio
-async def test_handle_duty_schedule_document_parse_error_replies_and_clears_user_data():
-    """handle_duty_schedule_document: parse_duty_schedule raises DutyScheduleParseError -> reply, clear user_data."""
+async def test_handle_duty_schedule_document_parse_error_replies_generic_and_clears_user_data():
+    """handle_duty_schedule_document: DutyScheduleParseError -> reply generic message (no str(e)), clear user_data."""
    message = MagicMock()
    message.document = _make_document()
    message.reply_text = AsyncMock()
@@ -299,17 +299,17 @@ async def test_handle_duty_schedule_document_parse_error_replies_and_clears_user
            with patch.object(mod, "parse_duty_schedule") as mock_parse:
                mock_parse.side_effect = DutyScheduleParseError("Bad JSON")
                with patch.object(mod, "t") as mock_t:
-                    mock_t.return_value = "Parse error: Bad JSON"
+                    mock_t.return_value = "The file could not be parsed."
                    await mod.handle_duty_schedule_document(update, context)
-    message.reply_text.assert_called_once_with("Parse error: Bad JSON")
-    mock_t.assert_called_with("en", "import.parse_error", error="Bad JSON")
+    message.reply_text.assert_called_once_with("The file could not be parsed.")
+    mock_t.assert_called_with("en", "import.parse_error_generic")
    assert "awaiting_duty_schedule_file" not in context.user_data
    assert "handover_utc_time" not in context.user_data


@pytest.mark.asyncio
-async def test_handle_duty_schedule_document_import_error_replies_and_clears_user_data():
-    """handle_duty_schedule_document: run_import in executor raises -> reply import_error, clear user_data."""
+async def test_handle_duty_schedule_document_import_error_replies_generic_and_clears_user_data():
+    """handle_duty_schedule_document: run_import raises -> reply generic message (no str(e)), clear user_data."""
    message = MagicMock()
    message.document = _make_document()
    message.reply_text = AsyncMock()
@@ -340,10 +340,10 @@ async def test_handle_duty_schedule_document_import_error_replies_and_clears_use
                    with patch.object(mod, "run_import") as mock_run:
                        mock_run.side_effect = ValueError("DB error")
                        with patch.object(mod, "t") as mock_t:
-                            mock_t.return_value = "Import error: DB error"
+                            mock_t.return_value = "Import failed. Please try again."
                            await mod.handle_duty_schedule_document(update, context)
-    message.reply_text.assert_called_once_with("Import error: DB error")
-    mock_t.assert_called_with("en", "import.import_error", error="DB error")
+    message.reply_text.assert_called_once_with("Import failed. Please try again.")
+    mock_t.assert_called_with("en", "import.import_error_generic")
    assert "awaiting_duty_schedule_file" not in context.user_data
    assert "handover_utc_time" not in context.user_data

--- a/tests/test_i18n.py
+++ b/tests/test_i18n.py
@@ -1,48 +1,46 @@
 """Unit tests for duty_teller.i18n: get_lang, t, fallback to en."""

-from unittest.mock import MagicMock
-
+from unittest.mock import MagicMock, patch

+import duty_teller.config as config
 from duty_teller.i18n import get_lang, t


-def test_get_lang_none_returns_en():
-    assert get_lang(None) == "en"
+def test_get_lang_always_returns_default_language():
+    """get_lang ignores user and always returns config.DEFAULT_LANGUAGE."""
+    assert get_lang(None) == config.DEFAULT_LANGUAGE
+    user_ru = MagicMock()
+    user_ru.language_code = "ru"
+    assert get_lang(user_ru) == config.DEFAULT_LANGUAGE
+    user_en = MagicMock()
+    user_en.language_code = "en"
+    assert get_lang(user_en) == config.DEFAULT_LANGUAGE
+    user_any = MagicMock(spec=[])
+    assert get_lang(user_any) == config.DEFAULT_LANGUAGE


-def test_get_lang_ru_returns_ru():
-    user = MagicMock()
-    user.language_code = "ru"
-    assert get_lang(user) == "ru"
+def test_get_lang_returns_ru_when_default_language_is_ru():
+    """When DEFAULT_LANGUAGE is ru, get_lang returns 'ru' regardless of user."""
+    with patch("duty_teller.i18n.core.config") as mock_cfg:
+        mock_cfg.DEFAULT_LANGUAGE = "ru"
+        from duty_teller.i18n.core import get_lang as core_get_lang
+
+        assert core_get_lang(None) == "ru"
+        user = MagicMock()
+        user.language_code = "en"
+        assert core_get_lang(user) == "ru"


-def test_get_lang_ru_ru_returns_ru():
-    user = MagicMock()
-    user.language_code = "ru-RU"
-    assert get_lang(user) == "ru"
+def test_get_lang_returns_en_when_default_language_is_en():
+    """When DEFAULT_LANGUAGE is en, get_lang returns 'en' regardless of user."""
+    with patch("duty_teller.i18n.core.config") as mock_cfg:
+        mock_cfg.DEFAULT_LANGUAGE = "en"
+        from duty_teller.i18n.core import get_lang as core_get_lang

-
-def test_get_lang_en_returns_en():
-    user = MagicMock()
-    user.language_code = "en"
-    assert get_lang(user) == "en"
-
-
-def test_get_lang_uk_returns_en():
-    user = MagicMock()
-    user.language_code = "uk"
-    assert get_lang(user) == "en"
-
-
-def test_get_lang_empty_returns_en():
-    user = MagicMock()
-    user.language_code = ""
-    assert get_lang(user) == "en"
-
-
-def test_get_lang_missing_attr_returns_en():
-    user = MagicMock(spec=[])  # no language_code
-    assert get_lang(user) == "en"
+        assert core_get_lang(None) == "en"
+        user = MagicMock()
+        user.language_code = "ru"
+        assert core_get_lang(user) == "en"


 def test_t_en_start_greeting():
--- a/tests/test_run.py
+++ b/tests/test_run.py
@@ -24,14 +24,23 @@ def test_main_builds_app_and_starts_thread():
    mock_scope.return_value.__exit__.return_value = None

    with patch("duty_teller.run.require_bot_token"):
-        with patch("duty_teller.run.ApplicationBuilder", return_value=mock_builder):
-            with patch("duty_teller.run.register_handlers") as mock_register:
-                with patch("duty_teller.run.threading.Thread") as mock_thread_class:
-                    with patch("duty_teller.db.session.session_scope", mock_scope):
-                        mock_thread = MagicMock()
-                        mock_thread_class.return_value = mock_thread
-                        with pytest.raises(KeyboardInterrupt):
-                            main()
+        with patch("duty_teller.run.config") as mock_cfg:
+            mock_cfg.MINI_APP_SKIP_AUTH = False
+            mock_cfg.HTTP_HOST = "127.0.0.1"
+            mock_cfg.HTTP_PORT = 8080
+            with patch("duty_teller.run.ApplicationBuilder", return_value=mock_builder):
+                with patch("duty_teller.run.register_handlers") as mock_register:
+                    with patch("duty_teller.run.threading.Thread") as mock_thread_class:
+                        with patch(
+                            "duty_teller.run._wait_for_http_ready", return_value=True
+                        ):
+                            with patch(
+                                "duty_teller.db.session.session_scope", mock_scope
+                            ):
+                                mock_thread = MagicMock()
+                                mock_thread_class.return_value = mock_thread
+                                with pytest.raises(KeyboardInterrupt):
+                                    main()
    mock_register.assert_called_once_with(mock_app)
    mock_builder.token.assert_called_once()
    mock_thread.start.assert_called_once()
--- a/tests/test_telegram_auth.py
+++ b/tests/test_telegram_auth.py
@@ -1,5 +1,8 @@
 """Tests for duty_teller.api.telegram_auth.validate_init_data and validate_init_data_with_reason."""

+from unittest.mock import patch
+
+import duty_teller.config as config
 from duty_teller.api.telegram_auth import (
    validate_init_data,
    validate_init_data_with_reason,
@@ -52,7 +55,7 @@ def test_user_without_username_returns_none_from_validate_init_data():


 def test_user_without_username_but_with_id_succeeds_with_reason():
-    """With validate_init_data_with_reason, valid user.id is enough; username may be None."""
+    """With validate_init_data_with_reason, valid user.id is enough; lang is DEFAULT_LANGUAGE."""
    bot_token = "123:ABC"
    user = {"id": 456, "first_name": "Test", "language_code": "ru"}
    init_data = make_init_data(user, bot_token)
@@ -62,11 +65,11 @@ def test_user_without_username_but_with_id_succeeds_with_reason():
    assert telegram_user_id == 456
    assert username is None
    assert reason == "ok"
-    assert lang == "ru"
+    assert lang == config.DEFAULT_LANGUAGE


 def test_user_without_id_returns_no_user_id():
-    """When user object exists but has no 'id', return no_user_id."""
+    """When user object exists but has no 'id', return no_user_id; lang is DEFAULT_LANGUAGE."""
    bot_token = "123:ABC"
    user = {"first_name": "Test"}  # no id
    init_data = make_init_data(user, bot_token)
@@ -76,7 +79,17 @@ def test_user_without_id_returns_no_user_id():
    assert telegram_user_id is None
    assert username is None
    assert reason == "no_user_id"
-    assert lang == "en"
+    assert lang == config.DEFAULT_LANGUAGE
+
+
+def test_validate_init_data_with_reason_returns_default_language_ignoring_user_lang():
+    """Returned lang is always config.DEFAULT_LANGUAGE, not user.language_code."""
+    with patch("duty_teller.api.telegram_auth.config.DEFAULT_LANGUAGE", "ru"):
+        user = {"id": 1, "first_name": "U", "language_code": "en"}
+        init_data = make_init_data(user, "123:ABC")
+        _, _, reason, lang = validate_init_data_with_reason(init_data, "123:ABC")
+        assert reason == "ok"
+        assert lang == "ru"


 def test_empty_init_data_returns_none():
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -1,6 +1,6 @@
 """Unit tests for utils (dates, user, handover)."""

-from datetime import date
+from datetime import date, timedelta

 import pytest

@@ -62,6 +62,23 @@ def test_validate_date_range_from_after_to():
    assert exc_info.value.kind == "from_after_to"


+def test_validate_date_range_too_large():
+    """Range longer than MAX_DATE_RANGE_DAYS raises range_too_large."""
+    from duty_teller.utils.dates import MAX_DATE_RANGE_DAYS
+
+    # from 2023-01-01 to 2025-06-01 is more than 731 days
+    with pytest.raises(DateRangeValidationError) as exc_info:
+        validate_date_range("2023-01-01", "2025-06-01")
+    assert exc_info.value.kind == "range_too_large"
+
+    # Exactly MAX_DATE_RANGE_DAYS + 1 day
+    from_d = date(2024, 1, 1)
+    to_d = from_d + timedelta(days=MAX_DATE_RANGE_DAYS + 1)
+    with pytest.raises(DateRangeValidationError) as exc_info:
+        validate_date_range(from_d.isoformat(), to_d.isoformat())
+    assert exc_info.value.kind == "range_too_large"
+
+
 # --- user ---


--- a/webapp-next/.gitignore
+++ b/webapp-next/.gitignore
@@ -0,0 +1,41 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.*
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/versions
+
+# testing
+/coverage
+
+# next.js
+/.next/
+/out/
+
+# production
+/build
+
+# misc
+.DS_Store
+*.pem
+
+# debug
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+.pnpm-debug.log*
+
+# env files (can opt-in for committing if needed)
+.env*
+
+# vercel
+.vercel
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts
--- a/webapp-next/README.md
+++ b/webapp-next/README.md
@@ -0,0 +1,36 @@
+This is a [Next.js](https://nextjs.org) project bootstrapped with [`create-next-app`](https://nextjs.org/docs/app/api-reference/cli/create-next-app).
+
+## Getting Started
+
+First, run the development server:
+
+```bash
+npm run dev
+# or
+yarn dev
+# or
+pnpm dev
+# or
+bun dev
+```
+
+Open [http://localhost:3000](http://localhost:3000) with your browser to see the result.
+
+You can start editing the page by modifying `app/page.tsx`. The page auto-updates as you edit the file.
+
+This project uses [`next/font`](https://nextjs.org/docs/app/building-your-application/optimizing/fonts) to automatically optimize and load [Geist](https://vercel.com/font), a new font family for Vercel.
+
+## Learn More
+
+To learn more about Next.js, take a look at the following resources:
+
+- [Next.js Documentation](https://nextjs.org/docs) - learn about Next.js features and API.
+- [Learn Next.js](https://nextjs.org/learn) - an interactive Next.js tutorial.
+
+You can check out [the Next.js GitHub repository](https://github.com/vercel/next.js) - your feedback and contributions are welcome!
+
+## Deploy on Vercel
+
+The easiest way to deploy your Next.js app is to use the [Vercel Platform](https://vercel.com/new?utm_medium=default-template&filter=next.js&utm_source=create-next-app&utm_campaign=create-next-app-readme) from the creators of Next.js.
+
+Check out our [Next.js deployment documentation](https://nextjs.org/docs/app/building-your-application/deploying) for more details.
--- a/webapp-next/components.json
+++ b/webapp-next/components.json
@@ -0,0 +1,23 @@
+{
+  "$schema": "https://ui.shadcn.com/schema.json",
+  "style": "new-york",
+  "rsc": true,
+  "tsx": true,
+  "tailwind": {
+    "config": "",
+    "css": "src/app/globals.css",
+    "baseColor": "zinc",
+    "cssVariables": true,
+    "prefix": ""
+  },
+  "iconLibrary": "lucide",
+  "rtl": false,
+  "aliases": {
+    "components": "@/components",
+    "utils": "@/lib/utils",
+    "ui": "@/components/ui",
+    "lib": "@/lib",
+    "hooks": "@/hooks"
+  },
+  "registries": {}
+}
--- a/webapp-next/eslint.config.mjs
+++ b/webapp-next/eslint.config.mjs
@@ -0,0 +1,18 @@
+import { defineConfig, globalIgnores } from "eslint/config";
+import nextVitals from "eslint-config-next/core-web-vitals";
+import nextTs from "eslint-config-next/typescript";
+
+const eslintConfig = defineConfig([
+  ...nextVitals,
+  ...nextTs,
+  // Override default ignores of eslint-config-next.
+  globalIgnores([
+    // Default ignores of eslint-config-next:
+    ".next/**",
+    "out/**",
+    "build/**",
+    "next-env.d.ts",
+  ]),
+]);
+
+export default eslintConfig;
--- a/webapp-next/next.config.ts
+++ b/webapp-next/next.config.ts
@@ -0,0 +1,10 @@
+import type { NextConfig } from "next";
+
+const nextConfig: NextConfig = {
+  output: "export",
+  basePath: "/app",
+  trailingSlash: true,
+  images: { unoptimized: true },
+};
+
+export default nextConfig;
--- a/webapp-next/package-lock.json
+++ b/webapp-next/package-lock.json
--- a/webapp-next/package.json
+++ b/webapp-next/package.json
@@ -0,0 +1,45 @@
+{
+  "name": "webapp-next",
+  "version": "0.1.0",
+  "private": true,
+  "engines": {
+    "node": ">=20.9.0"
+  },
+  "scripts": {
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "eslint src/",
+    "test": "vitest run",
+    "test:watch": "vitest"
+  },
+  "dependencies": {
+    "@telegram-apps/sdk-react": "^3.3.9",
+    "class-variance-authority": "^0.7.1",
+    "clsx": "^2.1.1",
+    "lucide-react": "^0.576.0",
+    "next": "16.1.6",
+    "radix-ui": "^1.4.3",
+    "react": "19.2.3",
+    "react-dom": "19.2.3",
+    "tailwind-merge": "^3.5.0",
+    "zustand": "^5.0.11"
+  },
+  "devDependencies": {
+    "@tailwindcss/postcss": "^4",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/react": "^16.3.0",
+    "@types/node": "^20",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
+    "@vitejs/plugin-react": "^4.5.2",
+    "eslint": "^9",
+    "eslint-config-next": "16.1.6",
+    "jsdom": "^26.0.0",
+    "shadcn": "^3.8.5",
+    "tailwindcss": "^4",
+    "tw-animate-css": "^1.4.0",
+    "typescript": "^5",
+    "vitest": "^3.2.4"
+  }
+}
--- a/webapp-next/postcss.config.mjs
+++ b/webapp-next/postcss.config.mjs
@@ -0,0 +1,7 @@
+const config = {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};
+
+export default config;
--- a/webapp-next/src/app/favicon.ico
+++ b/webapp-next/src/app/favicon.ico
--- a/webapp-next/src/app/global-error.tsx
+++ b/webapp-next/src/app/global-error.tsx
@@ -0,0 +1,52 @@
+/**
+ * Next.js root error boundary. Replaces the root layout when an unhandled error occurs.
+ * Must define its own html/body. For most runtime errors the in-app AppErrorBoundary is used.
+ */
+
+"use client";
+
+import "./globals.css";
+import { getLang, translate } from "@/i18n/messages";
+
+export default function GlobalError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string };
+  reset: () => void;
+}) {
+  const lang = getLang();
+  return (
+    <html
+      lang={lang === "ru" ? "ru" : "en"}
+      data-theme="dark"
+      suppressHydrationWarning
+    >
+      <head>
+        {/* Same theme detection as layout: hash / Telegram / prefers-color-scheme → data-theme */}
+        <script
+          dangerouslySetInnerHTML={{
+            __html: `(function(){var scheme='dark';var root=document.documentElement;var hash=typeof location!=='undefined'&&location.hash?location.hash.slice(1):'';if(hash){var params={};hash.split('&').forEach(function(p){var i=p.indexOf('=');if(i===-1)return;var k=decodeURIComponent(p.slice(0,i));var v=p.slice(i+1);params[k]=v;});if(params.tgWebAppColorScheme==='light'||params.tgWebAppColorScheme==='dark')scheme=params.tgWebAppColorScheme;if(params.tgWebAppThemeParams){try{var theme=JSON.parse(decodeURIComponent(params.tgWebAppThemeParams));var tgKeys=['bg_color','text_color','hint_color','link_color','button_color','button_text_color','secondary_bg_color','header_bg_color','accent_text_color','destructive_text_color','section_bg_color','section_header_text_color','section_separator_color','subtitle_text_color','bottom_bar_bg_color'];tgKeys.forEach(function(k){var v=theme[k];if(v&&typeof v==='string')root.style.setProperty('--tg-theme-'+k.replace(/_/g,'-'),v);});Object.keys(theme).forEach(function(k){var v=theme[k];if(v&&typeof v==='string')root.style.setProperty('--tg-theme-'+k.replace(/_/g,'-'),v);});}catch(e){}}}var twa=typeof window!=='undefined'&&window.Telegram&&window.Telegram.WebApp;if(scheme!=='light'&&scheme!=='dark'&&twa&&(twa.colorScheme==='light'||twa.colorScheme==='dark'))scheme=twa.colorScheme;if(scheme!=='light'&&scheme!=='dark'){try{var s=getComputedStyle(root).getPropertyValue('--tg-color-scheme').trim();if(s==='light'||s==='dark')scheme=s;}catch(e){} }if(scheme!=='light'&&scheme!=='dark')scheme=window.matchMedia&&window.matchMedia('(prefers-color-scheme: dark)').matches?'dark':'light';root.setAttribute('data-theme',scheme);if(twa){if(twa.setBackgroundColor)twa.setBackgroundColor('bg_color');if(twa.setHeaderColor)twa.setHeaderColor('bg_color');}})();`,
+          }}
+        />
+      </head>
+      <body className="antialiased">
+        <div className="flex min-h-screen flex-col items-center justify-center gap-4 bg-background px-4 text-foreground">
+          <h1 className="text-xl font-semibold">
+            {translate(lang, "error_boundary.message")}
+          </h1>
+          <p className="text-center text-muted-foreground">
+            {translate(lang, "error_boundary.description")}
+          </p>
+          <button
+            type="button"
+            onClick={() => reset()}
+            className="rounded-lg bg-primary px-4 py-2 text-primary-foreground hover:bg-primary/90"
+          >
+            {translate(lang, "error_boundary.reload")}
+          </button>
+        </div>
+      </body>
+    </html>
+  );
+}
--- a/webapp-next/src/app/globals.css
+++ b/webapp-next/src/app/globals.css
@@ -0,0 +1,314 @@
+@import "tailwindcss";
+@import "tw-animate-css";
+@import "shadcn/tailwind.css";
+
+@custom-variant dark (&:is([data-theme="dark"] *));
+
+@theme inline {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --font-sans: system-ui, -apple-system, sans-serif;
+  --font-mono: ui-monospace, monospace;
+  --color-chart-5: var(--chart-5);
+  --color-chart-4: var(--chart-4);
+  --color-chart-3: var(--chart-3);
+  --color-chart-2: var(--chart-2);
+  --color-chart-1: var(--chart-1);
+  --color-ring: var(--ring);
+  --color-input: var(--input);
+  --color-border: var(--border);
+  --color-destructive: var(--destructive);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-accent: var(--accent);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-muted: var(--muted);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-secondary: var(--secondary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-primary: var(--primary);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-popover: var(--popover);
+  --color-card-foreground: var(--card-foreground);
+  --color-card: var(--card);
+  --radius-sm: calc(var(--radius) - 4px);
+  --radius-md: calc(var(--radius) - 2px);
+  --radius-lg: var(--radius);
+  --radius-xl: calc(var(--radius) + 4px);
+  --radius-2xl: calc(var(--radius) + 8px);
+  --radius-3xl: calc(var(--radius) + 12px);
+  --radius-4xl: calc(var(--radius) + 16px);
+  /* App design tokens (Telegram Mini App) */
+  --color-surface: var(--surface);
+  --color-duty: var(--duty);
+  --color-today: var(--today);
+  --color-unavailable: var(--unavailable);
+  --color-vacation: var(--vacation);
+  --color-error: var(--error);
+  --max-width-app: 420px;
+}
+
+/* App design tokens: use Telegram theme vars with dark fallbacks so TG vars apply before data-theme */
+:root {
+  --bg: var(--tg-theme-bg-color, #17212b);
+  --surface: var(--tg-theme-secondary-bg-color, #232e3c);
+  --text: var(--tg-theme-text-color, #f5f5f5);
+  --muted: var(--tg-theme-hint-color, var(--tg-theme-subtitle-text-color, #708499));
+  --accent: var(--tg-theme-link-color, #6ab3f3);
+  --header-bg: var(--tg-theme-header-bg-color, #232e3c);
+  --card: var(--tg-theme-section-bg-color, var(--surface));
+  --section-header: var(--tg-theme-section-header-text-color, #f5f5f5);
+  --border: var(--tg-theme-section-separator-color, color-mix(in srgb, var(--text) 10%, transparent));
+  --primary: var(--tg-theme-button-color, var(--accent));
+  --primary-foreground: var(--tg-theme-button-text-color, #17212b);
+  --error: var(--tg-theme-destructive-text-color, #e06c75);
+  --accent-text: var(--tg-theme-accent-text-color, #6ab2f2);
+  --duty: #5c9b4a;
+  --today: var(--tg-theme-accent-text-color, var(--tg-theme-link-color, #6ab2f2));
+  --unavailable: #b8860b;
+  --vacation: #5a9bb8;
+  --timeline-date-width: 3.6em;
+  --timeline-track-width: 10px;
+  /* Reusable color-mix tokens (avoid repeating in Tailwind classes). */
+  --surface-hover: color-mix(in srgb, var(--accent) 15%, var(--surface));
+  --surface-hover-10: color-mix(in srgb, var(--accent) 10%, var(--surface));
+  --surface-today-tint: color-mix(in srgb, var(--today) 12%, var(--surface));
+  --surface-muted-tint: color-mix(in srgb, var(--muted) 8%, var(--surface));
+  --today-hover: color-mix(in srgb, var(--bg) 15%, var(--today));
+  --today-border: color-mix(in srgb, var(--today) 35%, transparent);
+  --today-border-selected: color-mix(in srgb, var(--bg) 50%, transparent);
+  --today-gradient-end: color-mix(in srgb, var(--today) 15%, transparent);
+  --muted-fade: color-mix(in srgb, var(--muted) 40%, transparent);
+  --handle-bg: color-mix(in srgb, var(--muted) 80%, var(--text));
+  --indicator-today-duty: color-mix(in srgb, var(--duty) 65%, var(--bg));
+  --indicator-today-unavailable: color-mix(in srgb, var(--unavailable) 65%, var(--bg));
+  --indicator-today-vacation: color-mix(in srgb, var(--vacation) 65%, var(--bg));
+  --indicator-today-events: color-mix(in srgb, var(--accent) 65%, var(--bg));
+  --shadow-card: 0 4px 12px color-mix(in srgb, var(--text) 12%, transparent);
+  --transition-fast: 0.15s;
+  --transition-normal: 0.25s;
+  --ease-out: cubic-bezier(0.32, 0.72, 0, 1);
+  --radius: 0.625rem;
+  --calendar-block-min-height: 260px;
+  /** Minimum height for the 6-row calendar grid so cells stay comfortably large. */
+  --calendar-grid-min-height: 264px;
+  /** Minimum height per calendar row (6 rows × 44px ≈ 264px). */
+  --calendar-row-min-height: 2.75rem;
+  /* Align Tailwind/shadcn semantic tokens with app tokens for Mini App */
+  --background: var(--bg);
+  --foreground: var(--text);
+  --card-foreground: var(--text);
+  --popover: var(--surface);
+  --popover-foreground: var(--text);
+  --secondary: var(--surface);
+  --secondary-foreground: var(--text);
+  --muted-foreground: var(--muted);
+  --accent-foreground: var(--bg);
+  --destructive: var(--error);
+  --input: color-mix(in srgb, var(--text) 15%, transparent);
+  --ring: var(--accent);
+  --chart-1: var(--duty);
+  --chart-2: var(--vacation);
+  --chart-3: var(--unavailable);
+  --chart-4: var(--today);
+  --chart-5: var(--accent);
+}
+
+/* Light theme: full Telegram themeParams (14 params) mapping */
+[data-theme="light"] {
+  --bg: var(--tg-theme-bg-color, #f0f1f3);
+  --surface: var(--tg-theme-secondary-bg-color, #e0e2e6);
+  --text: var(--tg-theme-text-color, #343b58);
+  --muted: var(--tg-theme-hint-color, var(--tg-theme-subtitle-text-color, #6b7089));
+  --accent: var(--tg-theme-link-color, #2e7de0);
+  --header-bg: var(--tg-theme-header-bg-color, #e0e2e6);
+  --card: var(--tg-theme-section-bg-color, #e0e2e6);
+  --section-header: var(--tg-theme-section-header-text-color, #343b58);
+  --border: var(--tg-theme-section-separator-color, color-mix(in srgb, var(--text) 15%, transparent));
+  --primary: var(--tg-theme-button-color, #2e7de0);
+  --primary-foreground: var(--tg-theme-button-text-color, #ffffff);
+  --error: var(--tg-theme-destructive-text-color, #c43b3b);
+  --accent-text: var(--tg-theme-accent-text-color, #2481cc);
+  --duty: #587d0a;
+  --today: var(--tg-theme-accent-text-color, var(--tg-theme-link-color, #2481cc));
+  --unavailable: #b8860b;
+  --vacation: #0d6b9e;
+}
+
+/* Dark theme: full Telegram themeParams (14 params) mapping */
+[data-theme="dark"] {
+  --bg: var(--tg-theme-bg-color, #17212b);
+  --surface: var(--tg-theme-secondary-bg-color, #232e3c);
+  --text: var(--tg-theme-text-color, #f5f5f5);
+  --muted: var(--tg-theme-hint-color, var(--tg-theme-subtitle-text-color, #708499));
+  --accent: var(--tg-theme-link-color, #6ab3f3);
+  --header-bg: var(--tg-theme-header-bg-color, #232e3c);
+  --card: var(--tg-theme-section-bg-color, #232e3c);
+  --section-header: var(--tg-theme-section-header-text-color, #f5f5f5);
+  --border: var(--tg-theme-section-separator-color, color-mix(in srgb, var(--text) 10%, transparent));
+  --primary: var(--tg-theme-button-color, #6ab3f3);
+  --primary-foreground: var(--tg-theme-button-text-color, #17212b);
+  --error: var(--tg-theme-destructive-text-color, #e06c75);
+  --accent-text: var(--tg-theme-accent-text-color, #6ab2f2);
+  --duty: #5c9b4a;
+  --today: var(--tg-theme-accent-text-color, var(--tg-theme-link-color, #6ab2f2));
+  --unavailable: #b8860b;
+  --vacation: #5a9bb8;
+}
+
+/* === Layout & base (ported from webapp/css/base.css) */
+html {
+  scrollbar-gutter: stable;
+  scrollbar-width: none;
+  -ms-overflow-style: none;
+  overscroll-behavior: none;
+}
+
+html::-webkit-scrollbar {
+  display: none;
+}
+
+/* Container: max-width, padding, safe area. Use .container for main wrapper if needed. */
+.container-app {
+  max-width: var(--max-width-app, 420px);
+  margin-left: auto;
+  margin-right: auto;
+  padding: 12px;
+  padding-top: 0;
+  padding-bottom: env(safe-area-inset-bottom, 12px);
+  border-radius: 12px;
+}
+
+/* Duty list: timeline date cell (non-today) — horizontal line and vertical tick to track */
+.duty-timeline-date:not(.duty-timeline-date--today)::before {
+  content: "";
+  position: absolute;
+  left: 0;
+  bottom: 4px;
+  width: calc(100% + var(--timeline-track-width) / 2);
+  height: 2px;
+  background: linear-gradient(
+    to right,
+    var(--muted-fade) 0%,
+    var(--muted-fade) 50%,
+    var(--muted) 70%,
+    var(--muted) 100%
+  );
+}
+
+.duty-timeline-date:not(.duty-timeline-date--today)::after {
+  content: "";
+  position: absolute;
+  left: calc(100% + (var(--timeline-track-width) / 2) - 1px);
+  bottom: 2px;
+  width: 2px;
+  height: 6px;
+  background: var(--muted);
+}
+
+/* Duty list: timeline date cell (today) — horizontal stripe + vertical tick in today color (same geometry as non-today) */
+.duty-timeline-date--today::before {
+  content: "";
+  position: absolute;
+  left: 0;
+  bottom: 5px;
+  width: calc(100% + var(--timeline-track-width) / 2);
+  height: 1px;
+  background: var(--today);
+}
+
+.duty-timeline-date--today::after {
+  content: "";
+  position: absolute;
+  left: calc(100% + (var(--timeline-track-width) / 2) - 1px);
+  bottom: 2px;
+  width: 2px;
+  height: 7px;
+  background: var(--today);
+}
+
+/* Duty list: current duty card — ensure left stripe uses --today (matches "Today" label and date stripe) */
+[data-current-duty] .border-l-today {
+  border-left-color: var(--today);
+  border-left-width: 3px;
+}
+
+/* Duty list: flip card (front = duty info, back = contacts) */
+.duty-flip-card {
+  perspective: 600px;
+}
+.duty-flip-inner {
+  transform-style: preserve-3d;
+}
+.duty-flip-front {
+  backface-visibility: hidden;
+  -webkit-backface-visibility: hidden;
+}
+.duty-flip-back {
+  backface-visibility: hidden;
+  -webkit-backface-visibility: hidden;
+  position: absolute;
+  inset: 0;
+  transform: rotateY(180deg);
+}
+
+@media (prefers-reduced-motion: reduce) {
+  *,
+  *::before,
+  *::after {
+    animation-duration: 0.01ms !important;
+    animation-iteration-count: 1 !important;
+    transition-duration: 0.01ms !important;
+  }
+}
+
+/* Safe area for Telegram Mini App (notch / status bar). */
+.pt-safe {
+  padding-top: env(safe-area-inset-top, 0);
+}
+
+/* Sticky calendar header: shadow when scrolled (useStickyScroll). */
+.sticky.is-scrolled {
+  box-shadow: 0 1px 0 0 var(--border);
+}
+
+/* Calendar grid: 6 rows with minimum height so cells stay large (restore pre-audit look). */
+.calendar-grid {
+  grid-template-rows: repeat(6, minmax(var(--calendar-row-min-height), 1fr));
+}
+
+/* Current duty card: entrance animation (respects prefers-reduced-motion via global rule). */
+@keyframes card-appear {
+  from {
+    opacity: 0;
+    transform: translateY(16px);
+  }
+  to {
+    opacity: 1;
+    transform: translateY(0);
+  }
+}
+
+.current-duty-card {
+  box-shadow: var(--shadow-card);
+  animation: card-appear 0.3s var(--ease-out);
+}
+
+.current-duty-card--no-duty {
+  border-top-color: var(--muted);
+}
+
+@layer base {
+  * {
+    box-sizing: border-box;
+    @apply border-border outline-ring/50;
+  }
+  body {
+    margin: 0;
+    padding: 0;
+    min-height: 100vh;
+    background: var(--bg);
+    color: var(--text);
+    font-family: system-ui, -apple-system, sans-serif;
+    -webkit-tap-highlight-color: transparent;
+  }
+}
--- a/webapp-next/src/app/layout.tsx
+++ b/webapp-next/src/app/layout.tsx
@@ -0,0 +1,48 @@
+import type { Metadata, Viewport } from "next";
+import { TooltipProvider } from "@/components/ui/tooltip";
+import { TelegramProvider } from "@/components/providers/TelegramProvider";
+import { AppErrorBoundary } from "@/components/AppErrorBoundary";
+import "./globals.css";
+
+export const metadata: Metadata = {
+  title: "Duty Teller",
+  description: "Team duty shift calendar and reminders",
+};
+
+export const viewport: Viewport = {
+  width: "device-width",
+  initialScale: 1,
+  viewportFit: "cover",
+};
+
+export default function RootLayout({
+  children,
+}: Readonly<{
+  children: React.ReactNode;
+}>) {
+  return (
+    <html lang="en" data-theme="dark" suppressHydrationWarning>
+      <head>
+        {/* Inline script: theme from hash (tgWebAppColorScheme + all 14 TG themeParams → --tg-theme-*), then data-theme and Mini App colors. */}
+        <script
+          dangerouslySetInnerHTML={{
+            __html: `(function(){var scheme='dark';var root=document.documentElement;var hash=typeof location!=='undefined'&&location.hash?location.hash.slice(1):'';if(hash){var params={};hash.split('&').forEach(function(p){var i=p.indexOf('=');if(i===-1)return;var k=decodeURIComponent(p.slice(0,i));var v=p.slice(i+1);params[k]=v;});if(params.tgWebAppColorScheme==='light'||params.tgWebAppColorScheme==='dark')scheme=params.tgWebAppColorScheme;if(params.tgWebAppThemeParams){try{var theme=JSON.parse(decodeURIComponent(params.tgWebAppThemeParams));var tgKeys=['bg_color','text_color','hint_color','link_color','button_color','button_text_color','secondary_bg_color','header_bg_color','accent_text_color','destructive_text_color','section_bg_color','section_header_text_color','section_separator_color','subtitle_text_color','bottom_bar_bg_color'];tgKeys.forEach(function(k){var v=theme[k];if(v&&typeof v==='string')root.style.setProperty('--tg-theme-'+k.replace(/_/g,'-'),v);});Object.keys(theme).forEach(function(k){var v=theme[k];if(v&&typeof v==='string')root.style.setProperty('--tg-theme-'+k.replace(/_/g,'-'),v);});}catch(e){}}}var twa=typeof window!=='undefined'&&window.Telegram&&window.Telegram.WebApp;if(scheme!=='light'&&scheme!=='dark'&&twa&&(twa.colorScheme==='light'||twa.colorScheme==='dark'))scheme=twa.colorScheme;if(scheme!=='light'&&scheme!=='dark'){try{var s=getComputedStyle(root).getPropertyValue('--tg-color-scheme').trim();if(s==='light'||s==='dark')scheme=s;}catch(e){} }if(scheme!=='light'&&scheme!=='dark')scheme=window.matchMedia&&window.matchMedia('(prefers-color-scheme: dark)').matches?'dark':'light';root.setAttribute('data-theme',scheme);if(twa){if(twa.setBackgroundColor)twa.setBackgroundColor('bg_color');if(twa.setHeaderColor)twa.setHeaderColor('bg_color');}})();`,
+          }}
+        />
+        <script
+          dangerouslySetInnerHTML={{
+            __html: `(function(){if(typeof window!=='undefined'&&window.__DT_LANG==null)window.__DT_LANG='en';})();`,
+          }}
+        />
+        <script src="/app/config.js" />
+      </head>
+      <body className="antialiased">
+        <TelegramProvider>
+          <AppErrorBoundary>
+            <TooltipProvider>{children}</TooltipProvider>
+          </AppErrorBoundary>
+        </TelegramProvider>
+      </body>
+    </html>
+  );
+}
--- a/webapp-next/src/app/not-found.tsx
+++ b/webapp-next/src/app/not-found.tsx
@@ -0,0 +1,25 @@
+/**
+ * Next.js 404 page. Shown when notFound() is called or route is unknown.
+ * For static export with a single route this is rarely hit; added for consistency.
+ */
+
+"use client";
+
+import Link from "next/link";
+import { useTranslation } from "@/i18n/use-translation";
+
+export default function NotFound() {
+  const { t } = useTranslation();
+  return (
+    <div className="flex min-h-screen flex-col items-center justify-center gap-4 bg-background px-4 text-foreground">
+      <h1 className="text-xl font-semibold">{t("not_found.title")}</h1>
+      <p className="text-muted-foreground">{t("not_found.description")}</p>
+      <Link
+        href="/"
+        className="rounded-lg bg-primary px-4 py-2 text-primary-foreground hover:bg-primary/90"
+      >
+        {t("not_found.open_calendar")}
+      </Link>
+    </div>
+  );
+}
--- a/webapp-next/src/app/page.test.tsx
+++ b/webapp-next/src/app/page.test.tsx
@@ -0,0 +1,54 @@
+/**
+ * Integration test for main page: calendar and header visible, lang from store.
+ * Ported from webapp/js/main.test.js applyLangToUi.
+ */
+
+import { describe, it, expect, beforeEach, vi } from "vitest";
+import { render, screen, waitFor } from "@testing-library/react";
+import Page from "./page";
+import { resetAppStore } from "@/test/test-utils";
+import { useAppStore } from "@/store/app-store";
+
+vi.mock("@/hooks/use-telegram-auth", () => ({
+  useTelegramAuth: () => ({
+    initDataRaw: "test-init",
+    startParam: undefined,
+    isLocalhost: true,
+  }),
+}));
+
+vi.mock("@/hooks/use-month-data", () => ({
+  useMonthData: () => ({
+    retry: vi.fn(),
+  }),
+}));
+
+describe("Page", () => {
+  beforeEach(() => {
+    resetAppStore();
+  });
+
+  it("renders calendar and header when store has default state", async () => {
+    render(<Page />);
+    expect(await screen.findByRole("grid", { name: "Calendar" })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: /previous month/i })).toBeInTheDocument();
+    expect(screen.getByRole("button", { name: /next month/i })).toBeInTheDocument();
+  });
+
+  it("sets document title and lang from store lang", async () => {
+    useAppStore.getState().setLang("en");
+    render(<Page />);
+    await screen.findByRole("grid", { name: "Calendar" });
+    expect(document.title).toBe("Duty Calendar");
+    expect(document.documentElement.lang).toBe("en");
+  });
+
+  it("sets document title for ru when store lang is ru", async () => {
+    (globalThis.window as unknown as { __DT_LANG?: string }).__DT_LANG = "ru";
+    render(<Page />);
+    await screen.findByRole("grid", { name: "Calendar" });
+    await waitFor(() => {
+      expect(document.title).toBe("Календарь дежурств");
+    });
+  });
+});
--- a/webapp-next/src/app/page.tsx
+++ b/webapp-next/src/app/page.tsx
@@ -0,0 +1,70 @@
+/**
+ * Main Mini App page: current duty deep link or calendar view.
+ * Delegates to CurrentDutyView or CalendarPage; runs theme and app init.
+ */
+
+"use client";
+
+import { useCallback, useEffect } from "react";
+import { useAppStore } from "@/store/app-store";
+import { useShallow } from "zustand/react/shallow";
+import { useTelegramTheme } from "@/hooks/use-telegram-theme";
+import { useTelegramAuth } from "@/hooks/use-telegram-auth";
+import { useAppInit } from "@/hooks/use-app-init";
+import { callMiniAppReadyOnce } from "@/lib/telegram-ready";
+import { CurrentDutyView } from "@/components/current-duty/CurrentDutyView";
+import { CalendarPage } from "@/components/CalendarPage";
+
+export default function Home() {
+  useTelegramTheme();
+
+  const { initDataRaw, startParam, isLocalhost } = useTelegramAuth();
+  const isAllowed = isLocalhost || !!initDataRaw;
+
+  useAppInit({ isAllowed, startParam });
+
+  const { currentView, setCurrentView, setSelectedDay, appContentReady } =
+    useAppStore(
+      useShallow((s) => ({
+        currentView: s.currentView,
+        setCurrentView: s.setCurrentView,
+        setSelectedDay: s.setSelectedDay,
+        appContentReady: s.appContentReady,
+      }))
+    );
+
+  // When content is ready, tell Telegram to hide native loading and show our app.
+  useEffect(() => {
+    if (appContentReady) {
+      callMiniAppReadyOnce();
+    }
+  }, [appContentReady]);
+
+  const handleBackFromCurrentDuty = useCallback(() => {
+    setCurrentView("calendar");
+    setSelectedDay(null);
+  }, [setCurrentView, setSelectedDay]);
+
+  const content =
+    currentView === "currentDuty" ? (
+      <div className="mx-auto flex min-h-screen w-full max-w-[var(--max-width-app)] flex-col bg-background px-3 pb-6 pt-safe">
+        <CurrentDutyView
+          onBack={handleBackFromCurrentDuty}
+          openedFromPin={startParam === "duty"}
+        />
+      </div>
+    ) : (
+      <CalendarPage isAllowed={isAllowed} initDataRaw={initDataRaw} />
+    );
+
+  return (
+    <div
+      style={{
+        visibility: appContentReady ? "visible" : "hidden",
+        minHeight: "100vh",
+      }}
+    >
+      {content}
+    </div>
+  );
+}
--- a/webapp-next/src/components/AppErrorBoundary.tsx
+++ b/webapp-next/src/components/AppErrorBoundary.tsx
@@ -0,0 +1,76 @@
+/**
+ * Error boundary that catches render errors in the app tree and shows a fallback
+ * with a reload option. Uses pure i18n (getLang/translate) so it does not depend
+ * on React context that might be broken.
+ */
+
+"use client";
+
+import React from "react";
+import { getLang } from "@/i18n/messages";
+import { translate } from "@/i18n/messages";
+import { Button } from "@/components/ui/button";
+
+interface AppErrorBoundaryProps {
+  children: React.ReactNode;
+}
+
+interface AppErrorBoundaryState {
+  hasError: boolean;
+}
+
+/**
+ * Catches JavaScript errors in the child tree and renders a fallback UI
+ * instead of crashing. Provides a Reload button to recover.
+ */
+export class AppErrorBoundary extends React.Component<
+  AppErrorBoundaryProps,
+  AppErrorBoundaryState
+> {
+  constructor(props: AppErrorBoundaryProps) {
+    super(props);
+    this.state = { hasError: false };
+  }
+
+  static getDerivedStateFromError(): AppErrorBoundaryState {
+    return { hasError: true };
+  }
+
+  componentDidCatch(error: Error, errorInfo: React.ErrorInfo): void {
+    if (typeof console !== "undefined" && console.error) {
+      console.error("AppErrorBoundary caught an error:", error, errorInfo);
+    }
+  }
+
+  handleReload = (): void => {
+    if (typeof window !== "undefined") {
+      window.location.reload();
+    }
+  };
+
+  render(): React.ReactNode {
+    if (this.state.hasError) {
+      const lang = getLang();
+      const message = translate(lang, "error_boundary.message");
+      const reloadLabel = translate(lang, "error_boundary.reload");
+      return (
+        <div
+          className="flex min-h-[200px] flex-col items-center justify-center gap-4 rounded-xl bg-surface py-8 px-4 text-center"
+          role="alert"
+        >
+          <p className="m-0 text-sm font-medium text-foreground">{message}</p>
+          <Button
+            type="button"
+            variant="default"
+            size="sm"
+            onClick={this.handleReload}
+            className="bg-primary text-primary-foreground hover:opacity-90"
+          >
+            {reloadLabel}
+          </Button>
+        </div>
+      );
+    }
+    return this.props.children;
+  }
+}
--- a/webapp-next/src/components/CalendarPage.tsx
+++ b/webapp-next/src/components/CalendarPage.tsx
@@ -0,0 +1,179 @@
+/**
+ * Calendar view layout: header, grid, duty list, day detail.
+ * Composes calendar UI and owns sticky scroll, swipe, month data, and day-detail ref.
+ */
+
+"use client";
+
+import { useRef, useState, useEffect, useCallback } from "react";
+import { useAppStore } from "@/store/app-store";
+import { useShallow } from "zustand/react/shallow";
+import { useMonthData } from "@/hooks/use-month-data";
+import { useSwipe } from "@/hooks/use-swipe";
+import { useStickyScroll } from "@/hooks/use-sticky-scroll";
+import { useAutoRefresh } from "@/hooks/use-auto-refresh";
+import { CalendarHeader } from "@/components/calendar/CalendarHeader";
+import { CalendarGrid } from "@/components/calendar/CalendarGrid";
+import { DutyList } from "@/components/duty/DutyList";
+import { DayDetail, type DayDetailHandle } from "@/components/day-detail";
+import { ErrorState } from "@/components/states/ErrorState";
+import { AccessDenied } from "@/components/states/AccessDenied";
+
+/** Fallback height (px) until ResizeObserver reports the sticky block size. Matches --calendar-block-min-height + pb-2 (260 + 8). */
+const STICKY_HEIGHT_FALLBACK_PX = 268;
+
+export interface CalendarPageProps {
+  /** Whether the user is allowed (for data loading). */
+  isAllowed: boolean;
+  /** Raw initData string for API auth. */
+  initDataRaw: string | undefined;
+}
+
+export function CalendarPage({ isAllowed, initDataRaw }: CalendarPageProps) {
+  const dayDetailRef = useRef<DayDetailHandle>(null);
+  const calendarStickyRef = useRef<HTMLDivElement>(null);
+  const [stickyBlockHeight, setStickyBlockHeight] = useState(STICKY_HEIGHT_FALLBACK_PX);
+
+  useEffect(() => {
+    const el = calendarStickyRef.current;
+    if (!el) return;
+    const observer = new ResizeObserver((entries) => {
+      const entry = entries[0];
+      if (entry) setStickyBlockHeight(entry.contentRect.height);
+    });
+    observer.observe(el);
+    return () => observer.disconnect();
+  }, []);
+
+  const {
+    currentMonth,
+    pendingMonth,
+    loading,
+    error,
+    accessDenied,
+    accessDeniedDetail,
+    duties,
+    calendarEvents,
+    selectedDay,
+    nextMonth,
+    prevMonth,
+    setCurrentMonth,
+    setSelectedDay,
+    setAppContentReady,
+  } = useAppStore(
+    useShallow((s) => ({
+      currentMonth: s.currentMonth,
+      pendingMonth: s.pendingMonth,
+      loading: s.loading,
+      error: s.error,
+      accessDenied: s.accessDenied,
+      accessDeniedDetail: s.accessDeniedDetail,
+      duties: s.duties,
+      calendarEvents: s.calendarEvents,
+      selectedDay: s.selectedDay,
+      nextMonth: s.nextMonth,
+      prevMonth: s.prevMonth,
+      setCurrentMonth: s.setCurrentMonth,
+      setSelectedDay: s.setSelectedDay,
+      setAppContentReady: s.setAppContentReady,
+    }))
+  );
+
+  const { retry } = useMonthData({
+    initDataRaw,
+    enabled: isAllowed,
+  });
+
+  const now = new Date();
+  const isCurrentMonth =
+    currentMonth.getFullYear() === now.getFullYear() &&
+    currentMonth.getMonth() === now.getMonth();
+  useAutoRefresh(retry, isCurrentMonth);
+
+  const navDisabled = loading || accessDenied || selectedDay !== null;
+  const handlePrevMonth = useCallback(() => {
+    if (navDisabled) return;
+    prevMonth();
+  }, [navDisabled, prevMonth]);
+  const handleNextMonth = useCallback(() => {
+    if (navDisabled) return;
+    nextMonth();
+  }, [navDisabled, nextMonth]);
+
+  useSwipe(
+    calendarStickyRef,
+    handleNextMonth,
+    handlePrevMonth,
+    { threshold: 50, disabled: navDisabled }
+  );
+  useStickyScroll(calendarStickyRef);
+
+  const handleDayClick = useCallback(
+    (dateKey: string, anchorRect: DOMRect) => {
+      const [y, m] = dateKey.split("-").map(Number);
+      if (
+        y !== currentMonth.getFullYear() ||
+        m !== currentMonth.getMonth() + 1
+      ) {
+        return;
+      }
+      dayDetailRef.current?.openWithRect(dateKey, anchorRect);
+    },
+    [currentMonth]
+  );
+
+  const handleCloseDayDetail = useCallback(() => {
+    setSelectedDay(null);
+  }, [setSelectedDay]);
+
+  const readyCalledRef = useRef(false);
+  // Mark content ready when first load finishes or access denied, so page can call ready() and show content.
+  useEffect(() => {
+    if ((!loading || accessDenied) && !readyCalledRef.current) {
+      readyCalledRef.current = true;
+      setAppContentReady(true);
+    }
+  }, [loading, accessDenied, setAppContentReady]);
+
+  return (
+    <div className="mx-auto flex min-h-screen w-full max-w-[var(--max-width-app)] flex-col bg-background px-3 pb-6 pt-safe">
+      <div
+        ref={calendarStickyRef}
+        className="sticky top-0 z-10 min-h-[var(--calendar-block-min-height)] bg-background pb-2"
+      >
+        <CalendarHeader
+          month={currentMonth}
+          disabled={navDisabled}
+          onPrevMonth={handlePrevMonth}
+          onNextMonth={handleNextMonth}
+        />
+        <CalendarGrid
+          currentMonth={currentMonth}
+          duties={duties}
+          calendarEvents={calendarEvents}
+          onDayClick={handleDayClick}
+        />
+      </div>
+
+      {accessDenied && (
+        <AccessDenied serverDetail={accessDeniedDetail} className="my-3" />
+      )}
+      {!accessDenied && error && (
+        <ErrorState message={error} onRetry={retry} className="my-3" />
+      )}
+      {!accessDenied && !error && (
+        <DutyList
+          scrollMarginTop={stickyBlockHeight}
+          className="mt-2"
+        />
+      )}
+
+      <DayDetail
+        ref={dayDetailRef}
+        duties={duties}
+        calendarEvents={calendarEvents}
+        onClose={handleCloseDayDetail}
+      />
+    </div>
+  );
+}
--- a/webapp-next/src/components/calendar/CalendarDay.test.tsx
+++ b/webapp-next/src/components/calendar/CalendarDay.test.tsx
@@ -0,0 +1,79 @@
+/**
+ * Unit tests for CalendarDay: click opens day detail only for current month;
+ * other-month cells do not call onDayClick and are non-interactive (aria-disabled).
+ */
+
+import { describe, it, expect, beforeEach, vi } from "vitest";
+import { render, screen, fireEvent } from "@testing-library/react";
+import { CalendarDay } from "./CalendarDay";
+import { resetAppStore } from "@/test/test-utils";
+
+describe("CalendarDay", () => {
+  const defaultProps = {
+    dateKey: "2025-02-15",
+    dayOfMonth: 15,
+    isToday: false,
+    duties: [],
+    eventSummaries: [],
+    onDayClick: () => {},
+  };
+
+  beforeEach(() => {
+    resetAppStore();
+  });
+
+  it("calls onDayClick with dateKey and rect when clicked and isOtherMonth is false", () => {
+    const onDayClick = vi.fn();
+    render(
+      <CalendarDay
+        {...defaultProps}
+        isOtherMonth={false}
+        onDayClick={onDayClick}
+      />
+    );
+    const button = screen.getByRole("button", { name: /15/ });
+    fireEvent.click(button);
+
+    expect(onDayClick).toHaveBeenCalledTimes(1);
+    expect(onDayClick).toHaveBeenCalledWith(
+      "2025-02-15",
+      expect.objectContaining({
+        width: expect.any(Number),
+        height: expect.any(Number),
+        top: expect.any(Number),
+        left: expect.any(Number),
+      })
+    );
+  });
+
+  it("does not call onDayClick when clicked and isOtherMonth is true", () => {
+    const onDayClick = vi.fn();
+    render(
+      <CalendarDay
+        {...defaultProps}
+        isOtherMonth={true}
+        onDayClick={onDayClick}
+      />
+    );
+    const button = screen.getByRole("button", { name: /15/ });
+    fireEvent.click(button);
+
+    expect(onDayClick).not.toHaveBeenCalled();
+  });
+
+  it("sets aria-disabled on the button when isOtherMonth is true", () => {
+    render(
+      <CalendarDay {...defaultProps} isOtherMonth={true} onDayClick={() => {}} />
+    );
+    const button = screen.getByRole("button", { name: /15/ });
+    expect(button).toHaveAttribute("aria-disabled", "true");
+  });
+
+  it("is not disabled for interaction when isOtherMonth is false", () => {
+    render(
+      <CalendarDay {...defaultProps} isOtherMonth={false} onDayClick={() => {}} />
+    );
+    const button = screen.getByRole("button", { name: /15/ });
+    expect(button.getAttribute("aria-disabled")).not.toBe("true");
+  });
+});
--- a/webapp-next/src/components/calendar/CalendarDay.tsx
+++ b/webapp-next/src/components/calendar/CalendarDay.tsx
@@ -0,0 +1,123 @@
+/**
+ * Single calendar day cell: date number and day indicators. Click opens day detail.
+ * Ported from webapp/js/calendar.js day cell rendering.
+ */
+
+"use client";
+
+import React, { useMemo } from "react";
+import { useTranslation } from "@/i18n/use-translation";
+import { dateKeyToDDMM } from "@/lib/date-utils";
+import { cn } from "@/lib/utils";
+import type { DutyWithUser } from "@/types";
+import { DayIndicators } from "./DayIndicators";
+
+export interface CalendarDayProps {
+  /** YYYY-MM-DD key for this day. */
+  dateKey: string;
+  /** Day of month (1–31) for display. */
+  dayOfMonth: number;
+  isToday: boolean;
+  isOtherMonth: boolean;
+  /** Duties overlapping this day (for indicators and tooltip). */
+  duties: DutyWithUser[];
+  /** External calendar event summaries for this day. */
+  eventSummaries: string[];
+  onDayClick: (dateKey: string, anchorRect: DOMRect) => void;
+}
+
+function CalendarDayInner({
+  dateKey,
+  dayOfMonth,
+  isToday,
+  isOtherMonth,
+  duties,
+  eventSummaries,
+  onDayClick,
+}: CalendarDayProps) {
+  const { t } = useTranslation();
+  const { dutyList, unavailableList, vacationList } = useMemo(
+    () => ({
+      dutyList: duties.filter((d) => d.event_type === "duty"),
+      unavailableList: duties.filter((d) => d.event_type === "unavailable"),
+      vacationList: duties.filter((d) => d.event_type === "vacation"),
+    }),
+    [duties]
+  );
+  const hasEvent = eventSummaries.length > 0;
+  const showIndicator = !isOtherMonth;
+  const hasAny = duties.length > 0 || hasEvent;
+
+  const ariaParts: string[] = [dateKeyToDDMM(dateKey)];
+  if (hasAny && showIndicator) {
+    const counts: string[] = [];
+    if (dutyList.length) counts.push(`${dutyList.length} ${t("event_type.duty")}`);
+    if (unavailableList.length)
+      counts.push(`${unavailableList.length} ${t("event_type.unavailable")}`);
+    if (vacationList.length)
+      counts.push(`${vacationList.length} ${t("event_type.vacation")}`);
+    if (hasEvent) counts.push(t("hint.events"));
+    ariaParts.push(counts.join(", "));
+  } else {
+    ariaParts.push(t("aria.day_info"));
+  }
+  const ariaLabel = ariaParts.join("; ");
+
+  const content = (
+    <button
+      type="button"
+      aria-label={ariaLabel}
+      aria-disabled={isOtherMonth}
+      data-date={dateKey}
+      className={cn(
+        "relative flex w-full aspect-square min-h-8 min-w-0 flex-col items-center justify-start rounded-lg p-1 text-[0.85rem] transition-[background-color,transform] overflow-hidden",
+        "focus:outline-none focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-accent",
+        isOtherMonth &&
+          "pointer-events-none opacity-40 bg-[var(--surface-muted-tint)] cursor-default",
+        !isOtherMonth && [
+          "bg-surface hover:bg-[var(--surface-hover-10)]",
+          "active:scale-[0.98] cursor-pointer",
+          isToday && "bg-today text-[var(--bg)] hover:bg-[var(--today-hover)]",
+        ],
+        showIndicator && hasAny && "font-bold",
+        showIndicator &&
+          hasEvent &&
+          "bg-[linear-gradient(135deg,var(--surface)_0%,var(--today-gradient-end)_100%)] border border-[var(--today-border)]",
+        isToday &&
+          hasEvent &&
+          "bg-today text-[var(--bg)] border border-[var(--today-border-selected)]"
+      )}
+      onClick={(e) => {
+        if (isOtherMonth) return;
+        onDayClick(dateKey, e.currentTarget.getBoundingClientRect());
+      }}
+    >
+      <span className="num">{dayOfMonth}</span>
+      {showIndicator && (duties.length > 0 || hasEvent) && (
+        <DayIndicators
+          dutyCount={dutyList.length}
+          unavailableCount={unavailableList.length}
+          vacationCount={vacationList.length}
+          hasEvents={hasEvent}
+          isToday={isToday}
+        />
+      )}
+    </button>
+  );
+
+  return content;
+}
+
+function arePropsEqual(prev: CalendarDayProps, next: CalendarDayProps): boolean {
+  return (
+    prev.dateKey === next.dateKey &&
+    prev.dayOfMonth === next.dayOfMonth &&
+    prev.isToday === next.isToday &&
+    prev.isOtherMonth === next.isOtherMonth &&
+    prev.duties === next.duties &&
+    prev.eventSummaries === next.eventSummaries &&
+    prev.onDayClick === next.onDayClick
+  );
+}
+
+export const CalendarDay = React.memo(CalendarDayInner, arePropsEqual);
--- a/webapp-next/src/components/calendar/CalendarGrid.test.tsx
+++ b/webapp-next/src/components/calendar/CalendarGrid.test.tsx
@@ -0,0 +1,88 @@
+/**
+ * Unit tests for CalendarGrid: 42 cells, data-date, today class, month title in header.
+ * Ported from webapp/js/calendar.test.js renderCalendar.
+ */
+
+import { describe, it, expect, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { CalendarGrid } from "./CalendarGrid";
+import { CalendarHeader } from "./CalendarHeader";
+import { resetAppStore } from "@/test/test-utils";
+
+describe("CalendarGrid", () => {
+  beforeEach(() => {
+    resetAppStore();
+  });
+
+  it("renders 42 cells (6 weeks)", () => {
+    const currentMonth = new Date(2025, 0, 1); // January 2025
+    render(
+      <CalendarGrid
+        currentMonth={currentMonth}
+        duties={[]}
+        calendarEvents={[]}
+        onDayClick={() => {}}
+      />
+    );
+    const cells = screen.getAllByRole("button", { name: /;/ });
+    expect(cells.length).toBe(42);
+  });
+
+  it("sets data-date on each cell to YYYY-MM-DD", () => {
+    const currentMonth = new Date(2025, 0, 1);
+    render(
+      <CalendarGrid
+        currentMonth={currentMonth}
+        duties={[]}
+        calendarEvents={[]}
+        onDayClick={() => {}}
+      />
+    );
+    const grid = screen.getByRole("grid", { name: "Calendar" });
+    const buttons = grid.querySelectorAll('button[data-date]');
+    expect(buttons.length).toBe(42);
+    buttons.forEach((el) => {
+      const date = el.getAttribute("data-date");
+      expect(date).toMatch(/^\d{4}-\d{2}-\d{2}$/);
+    });
+  });
+
+  it("adds today styling to cell matching today", () => {
+    const today = new Date();
+    const currentMonth = new Date(today.getFullYear(), today.getMonth(), 1);
+    render(
+      <CalendarGrid
+        currentMonth={currentMonth}
+        duties={[]}
+        calendarEvents={[]}
+        onDayClick={() => {}}
+      />
+    );
+    const year = today.getFullYear();
+    const month = String(today.getMonth() + 1).padStart(2, "0");
+    const day = String(today.getDate()).padStart(2, "0");
+    const todayKey = `${year}-${month}-${day}`;
+    const todayCell = document.querySelector(`button[data-date="${todayKey}"]`);
+    expect(todayCell).toBeTruthy();
+    expect(todayCell?.className).toMatch(/today|bg-today/);
+  });
+});
+
+describe("CalendarHeader", () => {
+  beforeEach(() => {
+    resetAppStore();
+  });
+
+  it("sets month title from lang and given year/month", () => {
+    render(
+      <CalendarHeader
+        month={new Date(2025, 1, 1)}
+        onPrevMonth={() => {}}
+        onNextMonth={() => {}}
+      />
+    );
+    const heading = screen.getByRole("heading", { level: 1 });
+    expect(heading).toHaveTextContent("February");
+    expect(heading).toHaveTextContent("2025");
+  });
+});
--- a/webapp-next/src/components/calendar/CalendarGrid.tsx
+++ b/webapp-next/src/components/calendar/CalendarGrid.tsx
@@ -0,0 +1,93 @@
+/**
+ * 6-week (42-cell) calendar grid starting from Monday. Composes CalendarDay cells.
+ * Ported from webapp/js/calendar.js renderCalendar.
+ */
+
+"use client";
+
+import { useMemo } from "react";
+import {
+  firstDayOfMonth,
+  getMonday,
+  localDateString,
+} from "@/lib/date-utils";
+import type { CalendarEvent, DutyWithUser } from "@/types";
+import { dutiesByDate, calendarEventsByDate } from "@/lib/calendar-data";
+import { cn } from "@/lib/utils";
+import { CalendarDay } from "./CalendarDay";
+
+export interface CalendarGridProps {
+  /** Currently displayed month. */
+  currentMonth: Date;
+  /** All duties for the visible range (will be grouped by date). */
+  duties: DutyWithUser[];
+  /** All calendar events for the visible range. */
+  calendarEvents: CalendarEvent[];
+  /** Called when a day cell is clicked (opens day detail). Receives date key and cell rect for popover. */
+  onDayClick: (dateKey: string, anchorRect: DOMRect) => void;
+  className?: string;
+}
+
+const CELLS = 42;
+
+export function CalendarGrid({
+  currentMonth,
+  duties,
+  calendarEvents,
+  onDayClick,
+  className,
+}: CalendarGridProps) {
+  const dutiesByDateMap = useMemo(
+    () => dutiesByDate(duties),
+    [duties]
+  );
+  const calendarEventsByDateMap = useMemo(
+    () => calendarEventsByDate(calendarEvents),
+    [calendarEvents]
+  );
+  const todayKey = localDateString(new Date());
+
+  const cells = useMemo(() => {
+    const first = firstDayOfMonth(currentMonth);
+    const start = getMonday(first);
+    const result: { date: Date; key: string; month: number }[] = [];
+    const d = new Date(start);
+    for (let i = 0; i < CELLS; i++) {
+      const key = localDateString(d);
+      result.push({ date: new Date(d), key, month: d.getMonth() });
+      d.setDate(d.getDate() + 1);
+    }
+    return result;
+  }, [currentMonth]);
+
+  return (
+    <div
+      className={cn(
+        "calendar-grid grid grid-cols-7 gap-1 mb-4 min-h-[var(--calendar-grid-min-height)]",
+        className
+      )}
+      role="grid"
+      aria-label="Calendar"
+    >
+      {cells.map(({ date, key, month }, i) => {
+        const isOtherMonth = month !== currentMonth.getMonth();
+        const dayDuties = dutiesByDateMap[key] ?? [];
+        const eventSummaries = calendarEventsByDateMap[key] ?? [];
+
+        return (
+          <div key={`cell-${i}`} role="gridcell" className="min-h-0">
+            <CalendarDay
+              dateKey={key}
+              dayOfMonth={date.getDate()}
+              isToday={key === todayKey}
+              isOtherMonth={isOtherMonth}
+              duties={dayDuties}
+              eventSummaries={eventSummaries}
+              onDayClick={onDayClick}
+            />
+          </div>
+        );
+      })}
+    </div>
+  );
+}
--- a/webapp-next/src/components/calendar/CalendarHeader.tsx
+++ b/webapp-next/src/components/calendar/CalendarHeader.tsx
@@ -0,0 +1,82 @@
+/**
+ * Calendar header: month title, prev/next navigation, weekday labels.
+ * Replaces the header from webapp index.html and calendar.js month title.
+ */
+
+"use client";
+
+import { Button } from "@/components/ui/button";
+import { useTranslation } from "@/i18n/use-translation";
+import { cn } from "@/lib/utils";
+import {
+  ChevronLeft as ChevronLeftIcon,
+  ChevronRight as ChevronRightIcon,
+} from "lucide-react";
+
+export interface CalendarHeaderProps {
+  /** Currently displayed month (used for title). */
+  month: Date;
+  /** Whether month navigation is disabled (e.g. during loading). */
+  disabled?: boolean;
+  onPrevMonth: () => void;
+  onNextMonth: () => void;
+  className?: string;
+}
+
+export function CalendarHeader({
+  month,
+  disabled = false,
+  onPrevMonth,
+  onNextMonth,
+  className,
+}: CalendarHeaderProps) {
+  const { t, monthName, weekdayLabels } = useTranslation();
+  const year = month.getFullYear();
+  const monthIndex = month.getMonth();
+  const labels = weekdayLabels();
+
+  return (
+    <header className={cn("flex flex-col", className)}>
+      <div className="flex items-center justify-between mb-3">
+        <Button
+          type="button"
+          variant="secondary"
+          size="icon"
+          className="size-10 rounded-[10px] bg-surface text-accent hover:bg-[var(--surface-hover)] focus-visible:outline-accent active:scale-95 disabled:opacity-50"
+          aria-label={t("nav.prev_month")}
+          disabled={disabled}
+          onClick={onPrevMonth}
+        >
+          <ChevronLeftIcon className="size-5" aria-hidden />
+        </Button>
+        <div className="flex flex-col items-center gap-0.5">
+          <h1
+            className="m-0 flex items-center justify-center gap-2 text-[1.1rem] font-semibold sm:text-[1.25rem]"
+            aria-live="polite"
+            aria-atomic="true"
+          >
+            {monthName(monthIndex)} {year}
+          </h1>
+        </div>
+        <Button
+          type="button"
+          variant="secondary"
+          size="icon"
+          className="size-10 rounded-[10px] bg-surface text-accent hover:bg-[var(--surface-hover)] focus-visible:outline-accent active:scale-95 disabled:opacity-50"
+          aria-label={t("nav.next_month")}
+          disabled={disabled}
+          onClick={onNextMonth}
+        >
+          <ChevronRightIcon className="size-5" aria-hidden />
+        </Button>
+      </div>
+      <div className="grid grid-cols-7 gap-0.5 mb-1.5 text-center text-[0.75rem] text-muted">
+        {labels.map((label, i) => (
+          <span key={i} aria-hidden>
+            {label}
+          </span>
+        ))}
+      </div>
+    </header>
+  );
+}
--- a/webapp-next/src/components/calendar/DayIndicators.test.tsx
+++ b/webapp-next/src/components/calendar/DayIndicators.test.tsx
@@ -0,0 +1,71 @@
+/**
+ * Unit tests for DayIndicators: rounding is position-based (first / last segment),
+ * not by indicator type, so one or multiple segments form one pill.
+ */
+
+import { describe, it, expect } from "vitest";
+import { render } from "@testing-library/react";
+import { DayIndicators } from "./DayIndicators";
+
+const baseProps = {
+  dutyCount: 0,
+  unavailableCount: 0,
+  vacationCount: 0,
+  hasEvents: false,
+};
+
+describe("DayIndicators", () => {
+  it("renders nothing when no indicators", () => {
+    const { container } = render(<DayIndicators {...baseProps} />);
+    expect(container.firstChild).toBeNull();
+  });
+
+  it("renders one segment as pill (e.g. vacation only)", () => {
+    const { container } = render(
+      <DayIndicators {...baseProps} vacationCount={1} />
+    );
+    const wrapper = container.querySelector("[aria-hidden]");
+    expect(wrapper).toBeInTheDocument();
+    expect(wrapper?.className).toContain("[&>:first-child]:rounded-l-[3px]");
+    expect(wrapper?.className).toContain("[&>:last-child]:rounded-r-[3px]");
+    const spans = wrapper?.querySelectorAll("span");
+    expect(spans).toHaveLength(1);
+  });
+
+  it("renders two segments with positional rounding (duty + vacation)", () => {
+    const { container } = render(
+      <DayIndicators {...baseProps} dutyCount={1} vacationCount={1} />
+    );
+    const wrapper = container.querySelector("[aria-hidden]");
+    expect(wrapper).toBeInTheDocument();
+    expect(wrapper?.className).toContain(
+      "[&>:first-child]:rounded-l-[3px]"
+    );
+    expect(wrapper?.className).toContain(
+      "[&>:last-child]:rounded-r-[3px]"
+    );
+    const spans = wrapper?.querySelectorAll("span");
+    expect(spans).toHaveLength(2);
+  });
+
+  it("renders three segments with first left-rounded, last right-rounded (duty + unavailable + vacation)", () => {
+    const { container } = render(
+      <DayIndicators
+        {...baseProps}
+        dutyCount={1}
+        unavailableCount={1}
+        vacationCount={1}
+      />
+    );
+    const wrapper = container.querySelector("[aria-hidden]");
+    expect(wrapper).toBeInTheDocument();
+    expect(wrapper?.className).toContain(
+      "[&>:first-child]:rounded-l-[3px]"
+    );
+    expect(wrapper?.className).toContain(
+      "[&>:last-child]:rounded-r-[3px]"
+    );
+    const spans = wrapper?.querySelectorAll("span");
+    expect(spans).toHaveLength(3);
+  });
+});
--- a/webapp-next/src/components/calendar/DayIndicators.tsx
+++ b/webapp-next/src/components/calendar/DayIndicators.tsx
@@ -0,0 +1,65 @@
+/**
+ * Colored segments (pill bar) for calendar day: duty (green), unavailable (amber), vacation (blue), events (accent).
+ * Ported from webapp calendar day-indicator markup and markers.css.
+ *
+ * Rounding is position-based (first / last segment), so one or multiple segments always form a pill:
+ * first segment gets left rounding, last segment gets right rounding (single segment gets both).
+ */
+
+import { cn } from "@/lib/utils";
+
+export interface DayIndicatorsProps {
+  /** Number of duty slots this day. */
+  dutyCount: number;
+  /** Number of unavailable slots. */
+  unavailableCount: number;
+  /** Number of vacation slots. */
+  vacationCount: number;
+  /** Whether the day has external calendar events (e.g. holiday). */
+  hasEvents: boolean;
+  /** When true (e.g. today cell), use darker segments for contrast. */
+  isToday?: boolean;
+  className?: string;
+}
+
+export function DayIndicators({
+  dutyCount,
+  unavailableCount,
+  vacationCount,
+  hasEvents,
+  isToday = false,
+  className,
+}: DayIndicatorsProps) {
+  const hasAny = dutyCount > 0 || unavailableCount > 0 || vacationCount > 0 || hasEvents;
+  if (!hasAny) return null;
+
+  const dotClass = (variant: "duty" | "unavailable" | "vacation" | "events") =>
+    cn(
+      "min-w-0 flex-1 h-1 max-h-1.5",
+      variant === "duty" && "bg-duty",
+      variant === "unavailable" && "bg-unavailable",
+      variant === "vacation" && "bg-vacation",
+      variant === "events" && "bg-accent",
+      isToday && variant === "duty" && "bg-[var(--indicator-today-duty)]",
+      isToday && variant === "unavailable" && "bg-[var(--indicator-today-unavailable)]",
+      isToday && variant === "vacation" && "bg-[var(--indicator-today-vacation)]",
+      isToday && variant === "events" && "bg-[var(--indicator-today-events)]"
+    );
+
+  return (
+    <div
+      className={cn(
+        "flex w-[65%] justify-center gap-0.5 mt-1.5",
+        "[&>:first-child]:rounded-l-[3px]",
+        "[&>:last-child]:rounded-r-[3px]",
+        className
+      )}
+      aria-hidden
+    >
+      {dutyCount > 0 && <span className={dotClass("duty")} />}
+      {unavailableCount > 0 && <span className={dotClass("unavailable")} />}
+      {vacationCount > 0 && <span className={dotClass("vacation")} />}
+      {hasEvents && <span className={dotClass("events")} />}
+    </div>
+  );
+}
--- a/webapp-next/src/components/calendar/index.ts
+++ b/webapp-next/src/components/calendar/index.ts
@@ -0,0 +1,12 @@
+/**
+ * Calendar components and data helpers.
+ */
+
+export { CalendarGrid } from "./CalendarGrid";
+export { CalendarHeader } from "./CalendarHeader";
+export { CalendarDay } from "./CalendarDay";
+export { DayIndicators } from "./DayIndicators";
+export type { DayIndicatorsProps } from "./DayIndicators";
+export type { CalendarGridProps } from "./CalendarGrid";
+export type { CalendarHeaderProps } from "./CalendarHeader";
+export type { CalendarDayProps } from "./CalendarDay";
--- a/webapp-next/src/components/contact/ContactLinks.test.tsx
+++ b/webapp-next/src/components/contact/ContactLinks.test.tsx
@@ -0,0 +1,60 @@
+/**
+ * Unit tests for ContactLinks: phone/Telegram display, labels, layout.
+ * Ported from webapp/js/contactHtml.test.js buildContactLinksHtml.
+ */
+
+import { describe, it, expect, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { ContactLinks } from "./ContactLinks";
+import { resetAppStore } from "@/test/test-utils";
+
+describe("ContactLinks", () => {
+  beforeEach(() => {
+    resetAppStore();
+  });
+
+  it("returns null when phone and username are missing", () => {
+    const { container } = render(
+      <ContactLinks phone={null} username={null} />
+    );
+    expect(container.firstChild).toBeNull();
+  });
+
+  it("renders phone only with label and tel: link", () => {
+    render(<ContactLinks phone="+79991234567" username={null} showLabels />);
+    expect(document.querySelector('a[href^="tel:"]')).toBeInTheDocument();
+    expect(screen.getByText(/Phone/i)).toBeInTheDocument();
+  });
+
+  it("displays phone formatted for Russian numbers", () => {
+    render(<ContactLinks phone="79146522209" username={null} />);
+    expect(screen.getByText(/\+7 914 652-22-09/)).toBeInTheDocument();
+  });
+
+  it("renders username only with label and t.me link", () => {
+    render(<ContactLinks phone={null} username="alice_dev" showLabels />);
+    expect(document.querySelector('a[href*="t.me"]')).toBeInTheDocument();
+    expect(screen.getByText(/alice_dev/)).toBeInTheDocument();
+  });
+
+  it("renders both phone and username with labels", () => {
+    render(
+      <ContactLinks
+        phone="+79001112233"
+        username="bob"
+        showLabels
+      />
+    );
+    expect(document.querySelector('a[href^="tel:"]')).toBeInTheDocument();
+    expect(document.querySelector('a[href*="t.me"]')).toBeInTheDocument();
+    expect(screen.getByText(/\+7 900 111-22-33/)).toBeInTheDocument();
+    expect(screen.getByText(/@bob/)).toBeInTheDocument();
+  });
+
+  it("strips leading @ from username and displays with @", () => {
+    render(<ContactLinks phone={null} username="@alice" />);
+    const link = document.querySelector('a[href*="t.me/alice"]');
+    expect(link).toBeInTheDocument();
+    expect(link?.textContent).toContain("@alice");
+  });
+});
--- a/webapp-next/src/components/contact/ContactLinks.tsx
+++ b/webapp-next/src/components/contact/ContactLinks.tsx
@@ -0,0 +1,145 @@
+/**
+ * Contact links (phone, Telegram) for duty cards and day detail.
+ * Ported from webapp/js/contactHtml.js buildContactLinksHtml.
+ */
+
+"use client";
+
+import { useTranslation } from "@/i18n/use-translation";
+import { formatPhoneDisplay } from "@/lib/phone-format";
+import { Button } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+import { Phone as PhoneIcon, Send as TelegramIcon } from "lucide-react";
+
+export interface ContactLinksProps {
+  phone?: string | null;
+  username?: string | null;
+  layout?: "inline" | "block";
+  showLabels?: boolean;
+  /** Optional label for aria-label on links (e.g. duty holder name for "Call …", "Message … on Telegram"). */
+  contextLabel?: string;
+  className?: string;
+}
+
+const linkClass =
+  "text-accent hover:underline focus-visible:outline focus-visible:outline-2 focus-visible:outline-accent focus-visible:outline-offset-2";
+
+/**
+ * Renders phone (tel:) and Telegram (t.me) links. Used on flip card back and day detail.
+ */
+export function ContactLinks({
+  phone,
+  username,
+  layout = "inline",
+  showLabels = true,
+  contextLabel,
+  className,
+}: ContactLinksProps) {
+  const { t } = useTranslation();
+  const hasPhone = Boolean(phone && String(phone).trim());
+  const rawUsername = username && String(username).trim();
+  const cleanUsername = rawUsername ? rawUsername.replace(/^@+/, "") : "";
+  const hasUsername = Boolean(cleanUsername);
+
+  if (!hasPhone && !hasUsername) return null;
+
+  const ariaCall = contextLabel
+    ? t("contact.aria_call", { name: contextLabel })
+    : t("contact.phone");
+  const ariaTelegram = contextLabel
+    ? t("contact.aria_telegram", { name: contextLabel })
+    : t("contact.telegram");
+
+  if (layout === "block") {
+    return (
+      <div className={cn("flex flex-col gap-2", className)}>
+        {hasPhone && (
+          <Button
+            variant="outline"
+            size="sm"
+            className="h-12 justify-start gap-3 px-4 text-accent hover:bg-accent/10 hover:text-accent"
+            asChild
+          >
+            <a href={`tel:${String(phone).trim()}`} aria-label={ariaCall}>
+              <PhoneIcon className="size-5" aria-hidden />
+              <span>{formatPhoneDisplay(phone!)}</span>
+            </a>
+          </Button>
+        )}
+        {hasUsername && (
+          <Button
+            variant="outline"
+            size="sm"
+            className="h-12 justify-start gap-3 px-4 text-accent hover:bg-accent/10 hover:text-accent"
+            asChild
+          >
+            <a
+              href={`https://t.me/${encodeURIComponent(cleanUsername)}`}
+              target="_blank"
+              rel="noopener noreferrer"
+              aria-label={ariaTelegram}
+            >
+              <TelegramIcon className="size-5" aria-hidden />
+              <span>@{cleanUsername}</span>
+            </a>
+          </Button>
+        )}
+      </div>
+    );
+  }
+
+  const parts: React.ReactNode[] = [];
+  if (hasPhone) {
+    const displayPhone = formatPhoneDisplay(phone!);
+    parts.push(
+      showLabels ? (
+        <span key="phone">
+          {t("contact.phone")}:{" "}
+          <a
+            href={`tel:${String(phone).trim()}`}
+            className={linkClass}
+            aria-label={ariaCall}
+          >
+            {displayPhone}
+          </a>
+        </span>
+      ) : (
+        <a
+          key="phone"
+          href={`tel:${String(phone).trim()}`}
+          className={linkClass}
+          aria-label={ariaCall}
+        >
+          {displayPhone}
+        </a>
+      )
+    );
+  }
+  if (hasUsername) {
+    const href = `https://t.me/${encodeURIComponent(cleanUsername)}`;
+    const link = (
+      <a
+        key="tg"
+        href={href}
+        target="_blank"
+        rel="noopener noreferrer"
+        className={linkClass}
+        aria-label={ariaTelegram}
+      >
+        @{cleanUsername}
+      </a>
+    );
+    parts.push(showLabels ? <span key="tg">{t("contact.telegram")}: {link}</span> : link);
+  }
+
+  return (
+    <div className={cn("text-sm text-muted-foreground flex flex-wrap items-center gap-x-1", className)}>
+      {parts.map((p, i) => (
+        <span key={i} className="inline-flex items-center gap-x-1">
+          {i > 0 && <span aria-hidden className="text-muted-foreground">·</span>}
+          {p}
+        </span>
+      ))}
+    </div>
+  );
+}
--- a/webapp-next/src/components/contact/index.ts
+++ b/webapp-next/src/components/contact/index.ts
@@ -0,0 +1,6 @@
+/**
+ * Contact links component.
+ */
+
+export { ContactLinks } from "./ContactLinks";
+export type { ContactLinksProps } from "./ContactLinks";
--- a/webapp-next/src/components/current-duty/CurrentDutyView.test.tsx
+++ b/webapp-next/src/components/current-duty/CurrentDutyView.test.tsx
@@ -0,0 +1,84 @@
+/**
+ * Unit tests for CurrentDutyView: no-duty message, duty card with contacts.
+ * Ported from webapp/js/currentDuty.test.js renderCurrentDutyContent / showCurrentDutyView.
+ */
+
+import { describe, it, expect, beforeEach, vi } from "vitest";
+import { render, screen, fireEvent } from "@testing-library/react";
+import { CurrentDutyView } from "./CurrentDutyView";
+import { resetAppStore } from "@/test/test-utils";
+
+vi.mock("@/hooks/use-telegram-auth", () => ({
+  useTelegramAuth: () => ({
+    initDataRaw: "test-init",
+    startParam: undefined,
+    isLocalhost: true,
+  }),
+}));
+
+vi.mock("@/lib/api", () => ({
+  fetchDuties: vi.fn().mockResolvedValue([]),
+  AccessDeniedError: class AccessDeniedError extends Error {
+    serverDetail?: string;
+    constructor(m: string, d?: string) {
+      super(m);
+      this.serverDetail = d;
+    }
+  },
+}));
+
+describe("CurrentDutyView", () => {
+  beforeEach(() => {
+    resetAppStore();
+    vi.clearAllMocks();
+  });
+
+  it("shows loading then no-duty message when no active duty", async () => {
+    const onBack = vi.fn();
+    render(<CurrentDutyView onBack={onBack} />);
+    await screen.findByText(/No one is on duty|Сейчас никто не дежурит/i, {}, { timeout: 3000 });
+    expect(screen.getByText(/Back to calendar|Назад к календарю/i)).toBeInTheDocument();
+  });
+
+  it("back button calls onBack when clicked", async () => {
+    const onBack = vi.fn();
+    render(<CurrentDutyView onBack={onBack} />);
+    await screen.findByText(/No one is on duty|Сейчас никто не дежурит/i, {}, { timeout: 3000 });
+    const buttons = screen.getAllByRole("button", { name: /Back to calendar|Назад к календарю/i });
+    fireEvent.click(buttons[buttons.length - 1]);
+    expect(onBack).toHaveBeenCalled();
+  });
+
+  it("shows Close button when openedFromPin is true", async () => {
+    const onBack = vi.fn();
+    render(<CurrentDutyView onBack={onBack} openedFromPin={true} />);
+    await screen.findByText(/No one is on duty|Сейчас никто не дежурит/i, {}, { timeout: 3000 });
+    expect(screen.getByRole("button", { name: /Close|Закрыть/i })).toBeInTheDocument();
+    expect(screen.queryByText(/Back to calendar|Назад к календарю/i)).not.toBeInTheDocument();
+  });
+
+  it("shows contact info not set when duty has no phone or username", async () => {
+    const { fetchDuties } = await import("@/lib/api");
+    const now = new Date();
+    const start = new Date(now.getTime() - 60 * 60 * 1000); // 1 hour ago
+    const end = new Date(now.getTime() + 60 * 60 * 1000); // 1 hour from now
+    const dutyNoContacts = {
+      id: 1,
+      user_id: 1,
+      start_at: start.toISOString(),
+      end_at: end.toISOString(),
+      event_type: "duty" as const,
+      full_name: "Test User",
+      phone: null,
+      username: null,
+    };
+    vi.mocked(fetchDuties).mockResolvedValue([dutyNoContacts]);
+    const onBack = vi.fn();
+    render(<CurrentDutyView onBack={onBack} />);
+    await screen.findByText("Test User", {}, { timeout: 3000 });
+    expect(
+      screen.getByText(/Contact info not set|Контактные данные не указаны/i)
+    ).toBeInTheDocument();
+    vi.mocked(fetchDuties).mockResolvedValue([]);
+  });
+});
--- a/webapp-next/src/components/current-duty/CurrentDutyView.tsx
+++ b/webapp-next/src/components/current-duty/CurrentDutyView.tsx
@@ -0,0 +1,323 @@
+/**
+ * Current duty view: full-screen card when opened via Mini App deep link (startapp=duty).
+ * Fetches today's duties, finds the active one, shows name, shift, auto-updating remaining time,
+ * and contact links. Integrates with Telegram BackButton.
+ * Ported from webapp/js/currentDuty.js.
+ */
+
+"use client";
+
+import { useEffect, useState, useCallback } from "react";
+import { backButton, closeMiniApp } from "@telegram-apps/sdk-react";
+import { Calendar } from "lucide-react";
+import { useTranslation } from "@/i18n/use-translation";
+import { useAppStore } from "@/store/app-store";
+import { useTelegramAuth } from "@/hooks/use-telegram-auth";
+import { fetchDuties, AccessDeniedError } from "@/lib/api";
+import {
+  localDateString,
+  dateKeyToDDMM,
+  formatHHMM,
+} from "@/lib/date-utils";
+import { getRemainingTime, findCurrentDuty } from "@/lib/current-duty";
+import { ContactLinks } from "@/components/contact/ContactLinks";
+import { Button } from "@/components/ui/button";
+import {
+  Card,
+  CardContent,
+  CardFooter,
+  CardHeader,
+  CardTitle,
+} from "@/components/ui/card";
+import type { DutyWithUser } from "@/types";
+
+export interface CurrentDutyViewProps {
+  /** Called when user taps Back (in-app button or Telegram BackButton). */
+  onBack: () => void;
+  /** True when opened via pin button (startParam=duty). Shows Close instead of Back to calendar. */
+  openedFromPin?: boolean;
+}
+
+type ViewState = "loading" | "error" | "ready";
+
+/**
+ * Full-screen current duty view with Telegram BackButton and auto-updating remaining time.
+ */
+export function CurrentDutyView({ onBack, openedFromPin = false }: CurrentDutyViewProps) {
+  const { t } = useTranslation();
+  const lang = useAppStore((s) => s.lang);
+  const setAppContentReady = useAppStore((s) => s.setAppContentReady);
+  const { initDataRaw } = useTelegramAuth();
+
+  const [state, setState] = useState<ViewState>("loading");
+  const [duty, setDuty] = useState<DutyWithUser | null>(null);
+  const [errorMessage, setErrorMessage] = useState<string | null>(null);
+  const [remaining, setRemaining] = useState<{ hours: number; minutes: number } | null>(null);
+
+  const loadTodayDuties = useCallback(
+    async (signal?: AbortSignal | null) => {
+      const today = new Date();
+      const from = localDateString(today);
+      const to = from;
+      const initData = initDataRaw ?? "";
+      try {
+        const duties = await fetchDuties(from, to, initData, lang, signal);
+        if (signal?.aborted) return;
+        const active = findCurrentDuty(duties);
+        setDuty(active);
+        setState("ready");
+        if (active) {
+          setRemaining(getRemainingTime(active.end_at));
+        } else {
+          setRemaining(null);
+        }
+      } catch (e) {
+        if (signal?.aborted) return;
+        setState("error");
+        const msg =
+          e instanceof AccessDeniedError && e.serverDetail
+            ? e.serverDetail
+            : t("error_generic");
+        setErrorMessage(msg);
+        setDuty(null);
+        setRemaining(null);
+      }
+    },
+    [initDataRaw, lang, t]
+  );
+
+  // Fetch today's duties on mount; abort on unmount to avoid setState after unmount.
+  useEffect(() => {
+    const controller = new AbortController();
+    loadTodayDuties(controller.signal);
+    return () => controller.abort();
+  }, [loadTodayDuties]);
+
+  // Mark content ready when data is loaded or error, so page can call ready() and show content.
+  useEffect(() => {
+    if (state !== "loading") {
+      setAppContentReady(true);
+    }
+  }, [state, setAppContentReady]);
+
+  // Auto-update remaining time every second when there is an active duty.
+  useEffect(() => {
+    if (!duty) return;
+    const interval = setInterval(() => {
+      setRemaining(getRemainingTime(duty.end_at));
+    }, 1000);
+    return () => clearInterval(interval);
+  }, [duty]);
+
+  // Telegram BackButton: show on mount, hide on unmount, handle click.
+  useEffect(() => {
+    let offClick: (() => void) | undefined;
+    try {
+      if (backButton.mount.isAvailable()) {
+        backButton.mount();
+      }
+      if (backButton.show.isAvailable()) {
+        backButton.show();
+      }
+      if (backButton.onClick.isAvailable()) {
+        offClick = backButton.onClick(onBack);
+      }
+    } catch {
+      // Non-Telegram environment; BackButton not available.
+    }
+
+    return () => {
+      try {
+        if (typeof offClick === "function") offClick();
+        if (backButton.hide.isAvailable()) {
+          backButton.hide();
+        }
+      } catch {
+        // Ignore cleanup errors in non-Telegram environment.
+      }
+    };
+  }, [onBack]);
+
+  const handleBack = () => {
+    onBack();
+  };
+
+  const handleClose = () => {
+    if (closeMiniApp.isAvailable()) {
+      closeMiniApp();
+    } else {
+      onBack();
+    }
+  };
+
+  const primaryButtonLabel = openedFromPin ? t("current_duty.close") : t("current_duty.back");
+  const primaryButtonAriaLabel = openedFromPin
+    ? t("current_duty.close")
+    : t("current_duty.back");
+  const handlePrimaryAction = openedFromPin ? handleClose : handleBack;
+
+  if (state === "loading") {
+    return (
+      <div
+        className="flex min-h-[50vh] flex-col items-center justify-center gap-4 px-4"
+        role="status"
+        aria-live="polite"
+        aria-label={t("loading")}
+      >
+        <span
+          className="block size-8 shrink-0 rounded-full border-2 border-transparent border-t-accent motion-reduce:animate-none animate-spin"
+          aria-hidden
+        />
+        <p className="text-muted-foreground m-0">{t("loading")}</p>
+        <Button variant="outline" onClick={handlePrimaryAction} aria-label={primaryButtonAriaLabel}>
+          {primaryButtonLabel}
+        </Button>
+      </div>
+    );
+  }
+
+  if (state === "error") {
+    const handleRetry = () => {
+      setState("loading");
+      loadTodayDuties();
+    };
+    return (
+      <div className="flex min-h-[50vh] flex-col items-center justify-center gap-4 px-4">
+        <Card className="w-full max-w-[var(--max-width-app)]">
+          <CardContent className="pt-6">
+            <p className="text-error">{errorMessage}</p>
+          </CardContent>
+          <CardFooter className="flex flex-col gap-2 sm:flex-row sm:justify-end">
+            <Button
+              variant="default"
+              onClick={handleRetry}
+              aria-label={t("error.retry")}
+            >
+              {t("error.retry")}
+            </Button>
+            <Button
+              variant="outline"
+              onClick={handlePrimaryAction}
+              aria-label={primaryButtonAriaLabel}
+            >
+              {primaryButtonLabel}
+            </Button>
+          </CardFooter>
+        </Card>
+      </div>
+    );
+  }
+
+  if (!duty) {
+    return (
+      <div className="flex min-h-[50vh] flex-col items-center justify-center gap-4 px-4">
+        <Card className="current-duty-card--no-duty w-full max-w-[var(--max-width-app)] border-t-4 border-t-muted">
+          <CardHeader>
+            <CardTitle>{t("current_duty.title")}</CardTitle>
+          </CardHeader>
+          <CardContent className="flex flex-col items-center gap-4">
+            <span
+              className="flex items-center justify-center text-muted-foreground"
+              aria-hidden
+            >
+              <Calendar className="size-12" strokeWidth={1.5} />
+            </span>
+            <p className="text-center text-muted-foreground">
+              {t("current_duty.no_duty")}
+            </p>
+          </CardContent>
+          <CardFooter>
+            <Button onClick={handlePrimaryAction} aria-label={primaryButtonAriaLabel}>
+              {primaryButtonLabel}
+            </Button>
+          </CardFooter>
+        </Card>
+      </div>
+    );
+  }
+
+  const startLocal = localDateString(new Date(duty.start_at));
+  const endLocal = localDateString(new Date(duty.end_at));
+  const startDDMM = dateKeyToDDMM(startLocal);
+  const endDDMM = dateKeyToDDMM(endLocal);
+  const startTime = formatHHMM(duty.start_at);
+  const endTime = formatHHMM(duty.end_at);
+  const shiftStr = `${startDDMM} ${startTime} — ${endDDMM} ${endTime}`;
+  const rem = remaining ?? getRemainingTime(duty.end_at);
+  const remainingStr = t("current_duty.remaining", {
+    hours: String(rem.hours),
+    minutes: String(rem.minutes),
+  });
+  const endsAtStr = t("current_duty.ends_at", { time: endTime });
+
+  const displayTz =
+    typeof window !== "undefined" &&
+    (window as unknown as { __DT_TZ?: string }).__DT_TZ;
+  const shiftLabel = displayTz
+    ? t("current_duty.shift_tz", { tz: displayTz })
+    : t("current_duty.shift_local");
+
+  const hasContacts =
+    Boolean(duty.phone && String(duty.phone).trim()) ||
+    Boolean(duty.username && String(duty.username).trim());
+
+  return (
+    <div className="flex min-h-[50vh] flex-col items-center justify-center gap-4 px-4">
+      <Card
+        className="current-duty-card w-full max-w-[var(--max-width-app)] border-t-4 border-t-duty animate-in fade-in-0 slide-in-from-bottom-4 duration-300 motion-reduce:animate-none motion-reduce:duration-0"
+        role="article"
+        aria-labelledby="current-duty-title"
+      >
+        <CardHeader>
+          <CardTitle
+            id="current-duty-title"
+            className="flex items-center gap-2"
+          >
+            <span
+              className="inline-block size-2.5 shrink-0 rounded-full bg-duty animate-pulse motion-reduce:animate-none"
+              aria-hidden
+            />
+            {t("current_duty.title")}
+          </CardTitle>
+        </CardHeader>
+        <CardContent className="flex flex-col gap-3">
+          <p className="font-medium text-foreground" id="current-duty-name">
+            {duty.full_name}
+          </p>
+          <p className="text-sm text-muted-foreground">
+            {shiftLabel} {shiftStr}
+          </p>
+          <div
+            className="rounded-lg bg-duty/10 px-3 py-2 text-sm font-medium text-foreground"
+            aria-live="polite"
+            aria-atomic="true"
+          >
+            {remainingStr}
+          </div>
+          <p className="text-sm text-muted-foreground">{endsAtStr}</p>
+          {hasContacts ? (
+            <ContactLinks
+              phone={duty.phone}
+              username={duty.username}
+              layout="block"
+              showLabels={true}
+              contextLabel={duty.full_name ?? undefined}
+            />
+          ) : (
+            <p className="text-sm text-muted-foreground">
+              {t("current_duty.contact_info_not_set")}
+            </p>
+          )}
+        </CardContent>
+        <CardFooter>
+          <Button
+            onClick={handlePrimaryAction}
+            aria-label={primaryButtonAriaLabel}
+          >
+            {primaryButtonLabel}
+          </Button>
+        </CardFooter>
+      </Card>
+    </div>
+  );
+}
--- a/webapp-next/src/components/current-duty/index.ts
+++ b/webapp-next/src/components/current-duty/index.ts
@@ -0,0 +1,2 @@
+export { CurrentDutyView } from "./CurrentDutyView";
+export type { CurrentDutyViewProps } from "./CurrentDutyView";
--- a/webapp-next/src/components/day-detail/DayDetail.test.tsx
+++ b/webapp-next/src/components/day-detail/DayDetail.test.tsx
@@ -0,0 +1,77 @@
+/**
+ * Unit tests for DayDetailContent: sorts duties by start_at; duty entries show time and name only (no contact links).
+ * Ported from webapp/js/dayDetail.test.js buildDayDetailContent.
+ */
+
+import { describe, it, expect, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { DayDetailContent } from "./DayDetailContent";
+import { resetAppStore } from "@/test/test-utils";
+import type { DutyWithUser } from "@/types";
+
+function duty(
+  full_name: string,
+  start_at: string,
+  end_at: string,
+  extra: Partial<DutyWithUser> = {}
+): DutyWithUser {
+  return {
+    id: 1,
+    user_id: 1,
+    full_name,
+    start_at,
+    end_at,
+    event_type: "duty",
+    phone: null,
+    username: null,
+    ...extra,
+  };
+}
+
+describe("DayDetailContent", () => {
+  beforeEach(() => {
+    resetAppStore();
+  });
+
+  it("sorts duty list by start_at when input order is wrong", () => {
+    const dateKey = "2025-02-25";
+    const duties = [
+      duty("Петров", "2025-02-25T14:00:00Z", "2025-02-25T18:00:00Z", { id: 2 }),
+      duty("Иванов", "2025-02-25T09:00:00Z", "2025-02-25T14:00:00Z", { id: 1 }),
+    ];
+    render(
+      <DayDetailContent
+        dateKey={dateKey}
+        duties={duties}
+        eventSummaries={[]}
+      />
+    );
+    expect(screen.getByText("Иванов")).toBeInTheDocument();
+    expect(screen.getByText("Петров")).toBeInTheDocument();
+    const body = document.body.innerHTML;
+    const ivanovPos = body.indexOf("Иванов");
+    const petrovPos = body.indexOf("Петров");
+    expect(ivanovPos).toBeLessThan(petrovPos);
+  });
+
+  it("shows duty time and name on one line and does not show contact links", () => {
+    const dateKey = "2025-03-01";
+    const duties = [
+      duty("Alice", "2025-03-01T09:00:00Z", "2025-03-01T17:00:00Z", {
+        phone: "+79991234567",
+        username: "alice_dev",
+      }),
+    ];
+    render(
+      <DayDetailContent
+        dateKey={dateKey}
+        duties={duties}
+        eventSummaries={[]}
+      />
+    );
+    expect(screen.getByText("Alice")).toBeInTheDocument();
+    expect(document.querySelector('a[href^="tel:"]')).toBeNull();
+    expect(document.querySelector('a[href*="t.me"]')).toBeNull();
+    expect(screen.queryByText(/alice_dev/)).not.toBeInTheDocument();
+  });
+});
--- a/webapp-next/src/components/day-detail/DayDetail.tsx
+++ b/webapp-next/src/components/day-detail/DayDetail.tsx
@@ -0,0 +1,255 @@
+/**
+ * Day detail panel: shadcn Popover on desktop (>=640px), Sheet (bottom) on mobile.
+ * Renders DayDetailContent; anchor for popover is a virtual element at the clicked cell rect.
+ * Owns anchor rect state; parent opens via ref.current.openWithRect(dateKey, rect).
+ */
+
+"use client";
+
+import * as React from "react";
+import {
+  Popover,
+  PopoverAnchor,
+  PopoverContent,
+} from "@/components/ui/popover";
+import {
+  Sheet,
+  SheetContent,
+  SheetHeader,
+  SheetTitle,
+} from "@/components/ui/sheet";
+import { Button } from "@/components/ui/button";
+import { useIsDesktop } from "@/hooks/use-media-query";
+import { useTranslation } from "@/i18n/use-translation";
+import { dutiesByDate, calendarEventsByDate } from "@/lib/calendar-data";
+import { localDateString, dateKeyToDDMM } from "@/lib/date-utils";
+import { DayDetailContent } from "./DayDetailContent";
+import type { CalendarEvent, DutyWithUser } from "@/types";
+import { cn } from "@/lib/utils";
+import { useAppStore } from "@/store/app-store";
+
+/** Empty state for day detail: date and "no duties or events" message. */
+function DayDetailEmpty({ dateKey }: { dateKey: string }) {
+  const { t } = useTranslation();
+  const todayKey = localDateString(new Date());
+  const ddmm = dateKeyToDDMM(dateKey);
+  const title =
+    dateKey === todayKey ? t("duty.today") + ", " + ddmm : ddmm;
+  return (
+    <div className="flex flex-col gap-4">
+      <h2
+        id="day-detail-title"
+        className="text-[1.1rem] font-semibold leading-tight m-0"
+      >
+        {title}
+      </h2>
+      <p className="text-sm text-muted-foreground m-0">
+        {t("day_detail.no_events")}
+      </p>
+    </div>
+  );
+}
+
+export interface DayDetailHandle {
+  /** Open the panel for the given day with popover anchored at the given rect. */
+  openWithRect: (dateKey: string, anchorRect: DOMRect) => void;
+}
+
+export interface DayDetailProps {
+  /** All duties for the visible range (will be filtered by selectedDay). */
+  duties: DutyWithUser[];
+  /** All calendar events for the visible range. */
+  calendarEvents: CalendarEvent[];
+  /** Called when the panel should close. */
+  onClose: () => void;
+  className?: string;
+}
+
+/**
+ * Virtual anchor: invisible div at the given rect so Popover positions relative to it.
+ */
+function VirtualAnchor({
+  rect,
+  className,
+}: {
+  rect: DOMRect;
+  className?: string;
+}) {
+  return (
+    <div
+      className={cn("pointer-events-none fixed z-0", className)}
+      style={{
+        left: rect.left,
+        top: rect.bottom,
+        width: rect.width,
+        height: 1,
+      }}
+      aria-hidden
+    />
+  );
+}
+
+export const DayDetail = React.forwardRef<DayDetailHandle, DayDetailProps>(
+  function DayDetail({ duties, calendarEvents, onClose, className }, ref) {
+    const isDesktop = useIsDesktop();
+    const { t } = useTranslation();
+    const selectedDay = useAppStore((s) => s.selectedDay);
+    const setSelectedDay = useAppStore((s) => s.setSelectedDay);
+    const [anchorRect, setAnchorRect] = React.useState<DOMRect | null>(null);
+    const [exiting, setExiting] = React.useState(false);
+
+    const open = selectedDay !== null;
+
+    React.useImperativeHandle(
+      ref,
+      () => ({
+        openWithRect(dateKey: string, rect: DOMRect) {
+          setSelectedDay(dateKey);
+          setAnchorRect(rect);
+        },
+      }),
+      [setSelectedDay]
+    );
+
+    const handleClose = React.useCallback(() => {
+      setSelectedDay(null);
+      setAnchorRect(null);
+      setExiting(false);
+      onClose();
+    }, [setSelectedDay, onClose]);
+
+    /** Start close animation; actual unmount happens in onCloseAnimationEnd (or fallback timeout). */
+    const requestClose = React.useCallback(() => {
+      setExiting(true);
+    }, []);
+
+    // Fallback: if onAnimationEnd never fires (e.g. reduced motion), close after animation duration
+    React.useEffect(() => {
+      if (!exiting) return;
+      const fallback = window.setTimeout(() => {
+        handleClose();
+      }, 320);
+      return () => window.clearTimeout(fallback);
+    }, [exiting, handleClose]);
+
+    const dutiesByDateMap = React.useMemo(
+      () => dutiesByDate(duties),
+      [duties]
+    );
+    const eventsByDateMap = React.useMemo(
+      () => calendarEventsByDate(calendarEvents),
+      [calendarEvents]
+    );
+
+    const dayDuties = selectedDay ? dutiesByDateMap[selectedDay] ?? [] : [];
+    const dayEvents = selectedDay ? eventsByDateMap[selectedDay] ?? [] : [];
+    const hasContent = dayDuties.length > 0 || dayEvents.length > 0;
+
+    // Close popover/sheet on window resize so anchor position does not become stale.
+    React.useEffect(() => {
+      if (!open) return;
+      const onResize = () => handleClose();
+      window.addEventListener("resize", onResize);
+      return () => window.removeEventListener("resize", onResize);
+    }, [open, handleClose]);
+
+    const content =
+      selectedDay &&
+      (hasContent ? (
+        <DayDetailContent
+          dateKey={selectedDay}
+          duties={dayDuties}
+          eventSummaries={dayEvents}
+        />
+      ) : (
+        <DayDetailEmpty dateKey={selectedDay} />
+      ));
+
+    if (!open || !selectedDay) return null;
+
+  const panelClassName =
+    "max-w-[min(360px,calc(100vw-24px))] max-h-[70vh] overflow-auto bg-surface text-[var(--text)] rounded-xl shadow-lg p-4 pt-9";
+  const closeButton = (
+    <Button
+      type="button"
+      variant="ghost"
+      size="icon"
+      className="absolute top-2 right-2 h-8 w-8 text-muted hover:text-[var(--text)] rounded-lg"
+      onClick={requestClose}
+      aria-label={t("day_detail.close")}
+    >
+      <svg
+        xmlns="http://www.w3.org/2000/svg"
+        width="18"
+        height="18"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth="2"
+        strokeLinecap="round"
+        strokeLinejoin="round"
+        aria-hidden
+      >
+        <line x1="18" y1="6" x2="6" y2="18" />
+        <line x1="6" y1="6" x2="18" y2="18" />
+      </svg>
+    </Button>
+  );
+
+  const renderSheet = (withHandle: boolean) => (
+    <Sheet
+      open={!exiting && open}
+      onOpenChange={(o) => !o && requestClose()}
+    >
+      <SheetContent
+        side="bottom"
+        className={cn(
+          "rounded-t-2xl pt-3 pb-[calc(24px+env(safe-area-inset-bottom,0px))] max-h-[70vh] bg-[var(--surface)]",
+          className
+        )}
+        showCloseButton={false}
+        onCloseAnimationEnd={handleClose}
+      >
+        <div className="relative px-4">
+          {closeButton}
+          {withHandle && (
+            <div
+              className="w-10 h-1 rounded-full bg-[var(--handle-bg)] mx-auto mb-2"
+              aria-hidden
+            />
+          )}
+          <SheetHeader className="p-0">
+            <SheetTitle id="day-detail-sheet-title" className="sr-only">
+              {selectedDay}
+            </SheetTitle>
+          </SheetHeader>
+          {content}
+        </div>
+      </SheetContent>
+    </Sheet>
+  );
+
+  if (isDesktop === true && anchorRect != null) {
+    return (
+      <Popover open={open} onOpenChange={(o) => !o && handleClose()}>
+        <PopoverAnchor asChild>
+          <VirtualAnchor rect={anchorRect} />
+        </PopoverAnchor>
+        <PopoverContent
+          side="bottom"
+          sideOffset={8}
+          align="center"
+          className={cn(panelClassName, "relative", className)}
+          onCloseAutoFocus={(e) => e.preventDefault()}
+          onEscapeKeyDown={handleClose}
+        >
+          {closeButton}
+          {content}
+        </PopoverContent>
+      </Popover>
+    );
+  }
+
+  return renderSheet(true);
+  }
+);
--- a/webapp-next/src/components/day-detail/DayDetailContent.tsx
+++ b/webapp-next/src/components/day-detail/DayDetailContent.tsx
@@ -0,0 +1,219 @@
+/**
+ * Shared content for day detail: title and sections (duty, unavailable, vacation, events).
+ * Ported from webapp/js/dayDetail.js buildDayDetailContent.
+ */
+
+"use client";
+
+import { useMemo } from "react";
+import { useTranslation } from "@/i18n/use-translation";
+import { localDateString, dateKeyToDDMM } from "@/lib/date-utils";
+import { getDutyMarkerRows } from "@/lib/duty-marker-rows";
+import type { DutyWithUser } from "@/types";
+import { cn } from "@/lib/utils";
+
+const NBSP = "\u00a0";
+
+export interface DayDetailContentProps {
+  /** YYYY-MM-DD key for the day. */
+  dateKey: string;
+  /** Duties overlapping this day. */
+  duties: DutyWithUser[];
+  /** Calendar event summary strings for this day. */
+  eventSummaries: string[];
+  className?: string;
+}
+
+export function DayDetailContent({
+  dateKey,
+  duties,
+  eventSummaries,
+  className,
+}: DayDetailContentProps) {
+  const { t } = useTranslation();
+  const todayKey = localDateString(new Date());
+  const ddmm = dateKeyToDDMM(dateKey);
+  const title =
+    dateKey === todayKey ? t("duty.today") + ", " + ddmm : ddmm;
+
+  const fromLabel = t("hint.from");
+  const toLabel = t("hint.to");
+
+  const dutyList = useMemo(
+    () =>
+      duties
+        .filter((d) => d.event_type === "duty")
+        .sort(
+          (a, b) =>
+            new Date(a.start_at || 0).getTime() -
+            new Date(b.start_at || 0).getTime()
+        ),
+    [duties]
+  );
+
+  const unavailableList = useMemo(
+    () => duties.filter((d) => d.event_type === "unavailable"),
+    [duties]
+  );
+
+  const vacationList = useMemo(
+    () => duties.filter((d) => d.event_type === "vacation"),
+    [duties]
+  );
+
+  const dutyRows = useMemo(() => {
+    const hasTimes = dutyList.some((it) => it.start_at || it.end_at);
+    return hasTimes
+      ? getDutyMarkerRows(dutyList, dateKey, NBSP, fromLabel, toLabel)
+      : dutyList.map((d) => ({
+          id: d.id,
+          timePrefix: "",
+          fullName: d.full_name ?? "",
+          phone: d.phone,
+          username: d.username,
+        }));
+  }, [dutyList, dateKey, fromLabel, toLabel]);
+
+  const uniqueUnavailable = useMemo(
+    () => [
+      ...new Set(
+        unavailableList.map((d) => d.full_name ?? "").filter(Boolean)
+      ),
+    ],
+    [unavailableList]
+  );
+
+  const uniqueVacation = useMemo(
+    () => [
+      ...new Set(vacationList.map((d) => d.full_name ?? "").filter(Boolean)),
+    ],
+    [vacationList]
+  );
+
+  const summaries = eventSummaries ?? [];
+
+  return (
+    <div className={cn("flex flex-col gap-4", className)}>
+      <h2
+        id="day-detail-title"
+        className="text-[1.1rem] font-semibold leading-tight m-0"
+      >
+        {title}
+      </h2>
+      <div className="flex flex-col gap-4">
+        {dutyList.length > 0 && (
+          <section
+            className="day-detail-section-duty"
+            aria-labelledby="day-detail-duty-heading"
+          >
+            <h3
+              id="day-detail-duty-heading"
+              className="text-[0.8rem] font-semibold text-duty m-0 mb-1"
+            >
+              {t("event_type.duty")}
+            </h3>
+            <ul className="list-none pl-5 m-0 text-[0.9rem] leading-snug space-y-1 [&_li]:flex [&_li]:items-baseline [&_li]:gap-2">
+              {dutyRows.map((r) => (
+                <li key={r.id}>
+                  <span
+                    className="text-muted-foreground -ml-5 mr-0 shrink-0 select-none"
+                    aria-hidden
+                  >
+                    •
+                  </span>
+                  <span className="inline-flex items-baseline gap-1">
+                    {r.timePrefix && (
+                      <span className="text-muted-foreground">{r.timePrefix} — </span>
+                    )}
+                    <span className="font-semibold">{r.fullName}</span>
+                  </span>
+                </li>
+              ))}
+            </ul>
+          </section>
+        )}
+
+        {uniqueUnavailable.length > 0 && (
+          <section
+            className="day-detail-section-unavailable"
+            aria-labelledby="day-detail-unavailable-heading"
+          >
+            <h3
+              id="day-detail-unavailable-heading"
+              className="text-[0.8rem] font-semibold text-unavailable m-0 mb-1"
+            >
+              {t("event_type.unavailable")}
+            </h3>
+            <ul className="list-none pl-5 m-0 text-[0.9rem] leading-snug space-y-1 [&_li]:flex [&_li]:items-baseline [&_li]:gap-2">
+              {uniqueUnavailable.map((name) => (
+                <li key={name}>
+                  <span
+                    className="text-muted-foreground -ml-5 mr-0 shrink-0 select-none"
+                    aria-hidden
+                  >
+                    •
+                  </span>
+                  {name}
+                </li>
+              ))}
+            </ul>
+          </section>
+        )}
+
+        {uniqueVacation.length > 0 && (
+          <section
+            className="day-detail-section-vacation"
+            aria-labelledby="day-detail-vacation-heading"
+          >
+            <h3
+              id="day-detail-vacation-heading"
+              className="text-[0.8rem] font-semibold text-vacation m-0 mb-1"
+            >
+              {t("event_type.vacation")}
+            </h3>
+            <ul className="list-none pl-5 m-0 text-[0.9rem] leading-snug space-y-1 [&_li]:flex [&_li]:items-baseline [&_li]:gap-2">
+              {uniqueVacation.map((name) => (
+                <li key={name}>
+                  <span
+                    className="text-muted-foreground -ml-5 mr-0 shrink-0 select-none"
+                    aria-hidden
+                  >
+                    •
+                  </span>
+                  {name}
+                </li>
+              ))}
+            </ul>
+          </section>
+        )}
+
+        {summaries.length > 0 && (
+          <section
+            className="day-detail-section-events"
+            aria-labelledby="day-detail-events-heading"
+          >
+            <h3
+              id="day-detail-events-heading"
+              className="text-[0.8rem] font-semibold text-accent m-0 mb-1"
+            >
+              {t("hint.events")}
+            </h3>
+            <ul className="list-none pl-5 m-0 text-[0.9rem] leading-snug space-y-1 [&_li]:flex [&_li]:items-baseline [&_li]:gap-2">
+              {summaries.map((s) => (
+                <li key={String(s)}>
+                  <span
+                    className="text-muted-foreground -ml-5 mr-0 shrink-0 select-none"
+                    aria-hidden
+                  >
+                    •
+                  </span>
+                  {String(s)}
+                </li>
+              ))}
+            </ul>
+          </section>
+        )}
+      </div>
+    </div>
+  );
+}
--- a/webapp-next/src/components/day-detail/index.ts
+++ b/webapp-next/src/components/day-detail/index.ts
@@ -0,0 +1,4 @@
+export { DayDetail } from "./DayDetail";
+export { DayDetailContent } from "./DayDetailContent";
+export type { DayDetailContentProps } from "./DayDetailContent";
+export type { DayDetailHandle, DayDetailProps } from "./DayDetail";
--- a/webapp-next/src/components/duty/DutyItem.tsx
+++ b/webapp-next/src/components/duty/DutyItem.tsx
@@ -0,0 +1,80 @@
+/**
+ * Single duty row: event type label, name, time range.
+ * Used inside timeline cards and day detail. Ported from webapp/js/dutyList.js dutyItemHtml.
+ */
+
+"use client";
+
+import { useTranslation } from "@/i18n/use-translation";
+import { formatHHMM, formatDateKey } from "@/lib/date-utils";
+import { cn } from "@/lib/utils";
+import type { DutyWithUser } from "@/types";
+
+export interface DutyItemProps {
+  duty: DutyWithUser;
+  /** Override type label (e.g. "On duty now"). */
+  typeLabelOverride?: string;
+  /** Show "until HH:MM" instead of full range (for current duty). */
+  showUntilEnd?: boolean;
+  /** Extra class, e.g. for current duty highlight. */
+  isCurrent?: boolean;
+  className?: string;
+}
+
+const borderByType = {
+  duty: "border-l-duty",
+  unavailable: "border-l-unavailable",
+  vacation: "border-l-vacation",
+} as const;
+
+/**
+ * Renders type badge, name, and time. Timeline cards use event_type for border color.
+ */
+export function DutyItem({
+  duty,
+  typeLabelOverride,
+  showUntilEnd = false,
+  isCurrent = false,
+  className,
+}: DutyItemProps) {
+  const { t } = useTranslation();
+  const typeLabel =
+    typeLabelOverride ?? t(`event_type.${duty.event_type || "duty"}`);
+  const eventType = (duty.event_type || "duty") as keyof typeof borderByType;
+  const borderClass = isCurrent ? "border-l-today" : borderByType[eventType] ?? "border-l-duty";
+
+  let timeOrRange: string;
+  if (showUntilEnd && duty.event_type === "duty") {
+    timeOrRange = t("duty.until", { time: formatHHMM(duty.end_at) });
+  } else if (duty.event_type === "vacation" || duty.event_type === "unavailable") {
+    const startStr = formatDateKey(duty.start_at);
+    const endStr = formatDateKey(duty.end_at);
+    timeOrRange = startStr === endStr ? startStr : `${startStr} – ${endStr}`;
+  } else {
+    timeOrRange = `${formatHHMM(duty.start_at)} – ${formatHHMM(duty.end_at)}`;
+  }
+
+  return (
+    <div
+      className={cn(
+        "grid grid-cols-1 gap-y-0.5 items-baseline rounded-lg bg-surface px-2.5 py-2",
+        "border-l-[3px] shadow-sm",
+        "min-h-0",
+        borderClass,
+        isCurrent && "bg-[var(--surface-today-tint)]",
+        className
+      )}
+      data-slot="duty-item"
+    >
+      <span className="text-xs text-muted col-span-1 row-start-1">
+        {typeLabel}
+      </span>
+      <span className="font-semibold min-w-0 col-span-1 row-start-2 col-start-1">
+        {duty.full_name}
+      </span>
+      <span className="text-[0.8rem] text-muted col-span-1 row-start-3 col-start-1">
+        {timeOrRange}
+      </span>
+    </div>
+  );
+}
--- a/webapp-next/src/components/duty/DutyList.test.tsx
+++ b/webapp-next/src/components/duty/DutyList.test.tsx
@@ -0,0 +1,78 @@
+/**
+ * Unit tests for DutyList: renders timeline, flip card with contacts, duty items.
+ * Ported from webapp/js/dutyList.test.js.
+ */
+
+import { describe, it, expect, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { DutyList } from "./DutyList";
+import { useAppStore } from "@/store/app-store";
+import { resetAppStore } from "@/test/test-utils";
+import type { DutyWithUser } from "@/types";
+
+function duty(
+  full_name: string,
+  start_at: string,
+  end_at: string,
+  extra: Partial<DutyWithUser> = {}
+): DutyWithUser {
+  return {
+    id: 1,
+    user_id: 1,
+    full_name,
+    start_at,
+    end_at,
+    event_type: "duty",
+    phone: null,
+    username: null,
+    ...extra,
+  };
+}
+
+describe("DutyList", () => {
+  beforeEach(() => {
+    resetAppStore();
+    useAppStore.getState().setCurrentMonth(new Date(2025, 1, 1)); // Feb 2025
+  });
+
+  it("renders no duties message when duties empty and data loaded for month", () => {
+    useAppStore.getState().setDuties([]);
+    useAppStore.getState().batchUpdate({ dataForMonthKey: "2025-02" });
+    render(<DutyList />);
+    expect(screen.getByText(/No duties this month/i)).toBeInTheDocument();
+  });
+
+  it("renders compact loading placeholder when data not yet loaded for month (no skeleton)", () => {
+    useAppStore.getState().setDuties([]);
+    useAppStore.getState().batchUpdate({ dataForMonthKey: null });
+    render(<DutyList />);
+    expect(screen.queryByText(/No duties this month/i)).not.toBeInTheDocument();
+    expect(document.querySelector('[aria-busy="true"]')).toBeInTheDocument();
+    expect(document.querySelector('[data-slot="skeleton"]')).not.toBeInTheDocument();
+  });
+
+  it("renders duty with full_name and time range", () => {
+    useAppStore.getState().setDuties([
+      duty("Иванов", "2025-02-25T09:00:00Z", "2025-02-25T18:00:00Z"),
+    ]);
+    useAppStore.getState().setCurrentMonth(new Date(2025, 1, 1));
+    useAppStore.getState().batchUpdate({ dataForMonthKey: "2025-02" });
+    render(<DutyList />);
+    expect(screen.getByText("Иванов")).toBeInTheDocument();
+  });
+
+  it("renders flip card with contact links when phone or username present", () => {
+    useAppStore.getState().setDuties([
+      duty("Alice", "2025-03-01T09:00:00Z", "2025-03-01T17:00:00Z", {
+        phone: "+79991234567",
+        username: "alice_dev",
+      }),
+    ]);
+    useAppStore.getState().setCurrentMonth(new Date(2025, 2, 1));
+    useAppStore.getState().batchUpdate({ dataForMonthKey: "2025-03" });
+    render(<DutyList />);
+    expect(screen.getAllByText("Alice").length).toBeGreaterThanOrEqual(1);
+    expect(document.querySelector('a[href^="tel:"]')).toBeInTheDocument();
+    expect(document.querySelector('a[href*="t.me"]')).toBeInTheDocument();
+  });
+});
--- a/webapp-next/src/components/duty/DutyList.tsx
+++ b/webapp-next/src/components/duty/DutyList.tsx
@@ -0,0 +1,278 @@
+/**
+ * Duty timeline list for the current month: dates, track line, flip cards.
+ * Scrolls to current duty or today on mount. Ported from webapp/js/dutyList.js renderDutyList.
+ */
+
+"use client";
+
+import { useEffect, useMemo, useRef, useState } from "react";
+import { useAppStore } from "@/store/app-store";
+import { useShallow } from "zustand/react/shallow";
+import { useTranslation } from "@/i18n/use-translation";
+import {
+  localDateString,
+  firstDayOfMonth,
+  lastDayOfMonth,
+  dateKeyToDDMM,
+} from "@/lib/date-utils";
+import { cn } from "@/lib/utils";
+import { Skeleton } from "@/components/ui/skeleton";
+import { LoadingState } from "@/components/states/LoadingState";
+import { DutyTimelineCard } from "./DutyTimelineCard";
+
+/** Extra offset so the sticky calendar slightly overlaps the target card (card sits a bit under the calendar). */
+const SCROLL_OVERLAP_PX = 14;
+
+/**
+ * Skeleton placeholder for duty list (e.g. when loading a new month).
+ * Shows 4 card-shaped placeholders in timeline layout.
+ */
+export function DutyListSkeleton({ className }: { className?: string }) {
+  return (
+    <div className={cn("duty-timeline relative text-[0.9rem]", className)}>
+      <div
+        className="absolute left-[calc(var(--timeline-date-width)+var(--timeline-track-width)/2-1px)] top-0 bottom-0 w-0.5 pointer-events-none bg-gradient-to-b from-muted from-0% to-[85%] to-[var(--muted-fade)]"
+        aria-hidden
+      />
+      {[1, 2, 3, 4].map((i) => (
+        <div
+          key={i}
+          className="grid gap-x-1 items-start mb-2 min-h-0"
+          style={{
+            gridTemplateColumns:
+              "var(--timeline-date-width) var(--timeline-track-width) 1fr",
+          }}
+        >
+          <Skeleton className="h-14 w-12 rounded" />
+          <span className="min-w-0" aria-hidden />
+          <Skeleton className="h-20 w-full min-w-0 rounded-lg" />
+        </div>
+      ))}
+    </div>
+  );
+}
+
+export interface DutyListProps {
+  /** Offset from viewport top for scroll target (sticky calendar height + its padding, e.g. 268px). */
+  scrollMarginTop?: number;
+  className?: string;
+}
+
+/**
+ * Renders duty timeline (duty type only), grouped by date. Shows "Today" label and
+ * auto-scrolls to current duty or today block. Uses CSS variables --timeline-date-width, --timeline-track-width.
+ */
+export function DutyList({ scrollMarginTop = 268, className }: DutyListProps) {
+  const { t } = useTranslation();
+  const listRef = useRef<HTMLDivElement>(null);
+  const { currentMonth, duties, dataForMonthKey } = useAppStore(
+    useShallow((s) => ({
+      currentMonth: s.currentMonth,
+      duties: s.duties,
+      dataForMonthKey: s.dataForMonthKey,
+    }))
+  );
+  const monthKey = `${currentMonth.getFullYear()}-${String(currentMonth.getMonth() + 1).padStart(2, "0")}`;
+  const hasDataForMonth = dataForMonthKey === monthKey;
+
+  const { filtered, dates, dutiesByDateKey } = useMemo(() => {
+    const filteredList = duties.filter((d) => d.event_type === "duty");
+    const todayKey = localDateString(new Date());
+    const firstKey = localDateString(firstDayOfMonth(currentMonth));
+    const lastKey = localDateString(lastDayOfMonth(currentMonth));
+    const showTodayInMonth = todayKey >= firstKey && todayKey <= lastKey;
+
+    const dateSet = new Set<string>();
+    filteredList.forEach((d) =>
+      dateSet.add(localDateString(new Date(d.start_at)))
+    );
+    if (showTodayInMonth) dateSet.add(todayKey);
+    const datesList = Array.from(dateSet).sort();
+
+    const byDate: Record<string, typeof filteredList> = {};
+    datesList.forEach((date) => {
+      byDate[date] = filteredList
+        .filter((d) => localDateString(new Date(d.start_at)) === date)
+        .sort(
+          (a, b) =>
+            new Date(a.start_at).getTime() - new Date(b.start_at).getTime()
+        );
+    });
+
+    return {
+      filtered: filteredList,
+      dates: datesList,
+      dutiesByDateKey: byDate,
+    };
+  }, [currentMonth, duties]);
+
+  const todayKey = localDateString(new Date());
+  const [now, setNow] = useState(() => new Date());
+  const [flippedDutyId, setFlippedDutyId] = useState<number | null>(null);
+  useEffect(() => {
+    const id = setInterval(() => setNow(new Date()), 60_000);
+    return () => clearInterval(id);
+  }, []);
+  const scrolledForMonthRef = useRef<string | null>(null);
+  const prevScrollMarginTopRef = useRef<number>(scrollMarginTop);
+  const prevMonthKeyRef = useRef<string>(monthKey);
+
+  useEffect(() => {
+    if (scrollMarginTop !== prevScrollMarginTopRef.current) {
+      scrolledForMonthRef.current = null;
+      prevScrollMarginTopRef.current = scrollMarginTop;
+    }
+    if (prevMonthKeyRef.current !== monthKey) {
+      scrolledForMonthRef.current = null;
+      prevMonthKeyRef.current = monthKey;
+    }
+
+    const el = listRef.current;
+    if (!el) return;
+    const currentCard = el.querySelector<HTMLElement>("[data-current-duty]");
+    const todayBlock = el.querySelector<HTMLElement>("[data-today-block]");
+    const target = currentCard ?? todayBlock;
+    if (!target || scrolledForMonthRef.current === monthKey) return;
+
+    const effectiveMargin = Math.max(0, scrollMarginTop + SCROLL_OVERLAP_PX);
+    const scrollTo = () => {
+      const rect = target.getBoundingClientRect();
+      const scrollTop = window.scrollY + rect.top - effectiveMargin;
+      window.scrollTo({ top: scrollTop, behavior: "smooth" });
+      scrolledForMonthRef.current = monthKey;
+    };
+    requestAnimationFrame(() => {
+      requestAnimationFrame(scrollTo);
+    });
+  }, [filtered, dates.length, scrollMarginTop, monthKey]);
+
+  if (!hasDataForMonth) {
+    return (
+      <div aria-busy="true" className={className}>
+        <LoadingState asPlaceholder />
+      </div>
+    );
+  }
+
+  if (filtered.length === 0) {
+    return (
+      <div className={cn("flex flex-col gap-1", className)}>
+        <p className="text-sm text-muted m-0">{t("duty.none_this_month")}</p>
+        <p className="text-xs text-muted m-0">{t("duty.none_this_month_hint")}</p>
+      </div>
+    );
+  }
+
+  return (
+    <div ref={listRef} className={className}>
+      <div className="duty-timeline relative text-[0.9rem]">
+        {/* Vertical track line */}
+        <div
+          className="absolute left-[calc(var(--timeline-date-width)+var(--timeline-track-width)/2-1px)] top-0 bottom-0 w-0.5 pointer-events-none bg-gradient-to-b from-muted from-0% to-[85%] to-[var(--muted-fade)]"
+          aria-hidden
+        />
+        {dates.map((date) => {
+          const isToday = date === todayKey;
+          const dateLabel = dateKeyToDDMM(date);
+          const dayDuties = dutiesByDateKey[date] ?? [];
+
+          return (
+            <div
+              key={date}
+              className="mb-0"
+              style={isToday ? { scrollMarginTop: `${scrollMarginTop}px` } : undefined}
+              data-date={date}
+              data-today-block={isToday ? true : undefined}
+            >
+              {dayDuties.length > 0 ? (
+                dayDuties.map((duty) => {
+                  const start = new Date(duty.start_at);
+                  const end = new Date(duty.end_at);
+                  const isCurrent = start <= now && now < end;
+                  return (
+                    <div
+                      key={duty.id}
+                      className="grid gap-x-1 items-start mb-2 min-h-0"
+                      style={{
+                        gridTemplateColumns:
+                          "var(--timeline-date-width) var(--timeline-track-width) 1fr",
+                      }}
+                    >
+                      <TimelineDateCell
+                        dateLabel={dateLabel}
+                        isToday={isToday}
+                      />
+                      <span
+                        className="min-w-0"
+                        aria-hidden
+                      />
+                      <div
+                        className="min-w-0 overflow-hidden"
+                        {...(isCurrent ? { "data-current-duty": true } : {})}
+                      >
+                        <DutyTimelineCard
+                          duty={duty}
+                          isCurrent={isCurrent}
+                          isFlipped={flippedDutyId === duty.id}
+                          onFlipChange={(flip) =>
+                            setFlippedDutyId(flip ? duty.id : null)
+                          }
+                        />
+                      </div>
+                    </div>
+                  );
+                })
+              ) : (
+                <div
+                  className="grid gap-x-1 items-start mb-2 min-h-0"
+                  style={{
+                    gridTemplateColumns:
+                      "var(--timeline-date-width) var(--timeline-track-width) 1fr",
+                  }}
+                >
+                  <TimelineDateCell
+                    dateLabel={dateLabel}
+                    isToday={isToday}
+                  />
+                  <span className="min-w-0" aria-hidden />
+                  <div className="min-w-0" />
+                </div>
+              )}
+            </div>
+          );
+        })}
+      </div>
+    </div>
+  );
+}
+
+function TimelineDateCell({
+  dateLabel,
+  isToday,
+}: {
+  dateLabel: string;
+  isToday: boolean;
+}) {
+  const { t } = useTranslation();
+  return (
+    <span
+      className={cn(
+        "duty-timeline-date relative text-[0.8rem] text-muted pt-2.5 pb-2.5 flex-shrink-0 overflow-visible",
+        isToday && "duty-timeline-date--today flex flex-col items-start pt-1 text-today font-semibold"
+      )}
+    >
+      {isToday ? (
+        <>
+          <span className="duty-timeline-date-label text-today block leading-tight">
+            {t("duty.today")}
+          </span>
+          <span className="duty-timeline-date-day text-muted font-normal text-[0.75rem] block self-start text-left">
+            {dateLabel}
+          </span>
+        </>
+      ) : (
+        dateLabel
+      )}
+    </span>
+  );
+}
--- a/webapp-next/src/components/duty/DutyTimelineCard.tsx
+++ b/webapp-next/src/components/duty/DutyTimelineCard.tsx
@@ -0,0 +1,194 @@
+/**
+ * Timeline duty card: front = duty info + flip button; back = name + contacts + back button.
+ * Flip card only when duty has phone or username. Ported from webapp/js/dutyList.js dutyTimelineCardHtml.
+ */
+
+"use client";
+
+import { useState, useMemo, useRef } from "react";
+import { useTranslation } from "@/i18n/use-translation";
+import {
+  localDateString,
+  dateKeyToDDMM,
+  formatHHMM,
+} from "@/lib/date-utils";
+import { cn } from "@/lib/utils";
+import { ContactLinks } from "@/components/contact/ContactLinks";
+import { Button } from "@/components/ui/button";
+import type { DutyWithUser } from "@/types";
+import { Phone, ArrowLeft } from "lucide-react";
+
+export interface DutyTimelineCardProps {
+  duty: DutyWithUser;
+  isCurrent: boolean;
+  /** When provided, card is controlled: only one card can be flipped at a time (managed by parent). */
+  isFlipped?: boolean;
+  /** Called when user flips to contacts (true) or back (false). Used with isFlipped for controlled mode. */
+  onFlipChange?: (flipped: boolean) => void;
+}
+
+function buildTimeStr(duty: DutyWithUser): string {
+  const startLocal = localDateString(new Date(duty.start_at));
+  const endLocal = localDateString(new Date(duty.end_at));
+  const startDDMM = dateKeyToDDMM(startLocal);
+  const endDDMM = dateKeyToDDMM(endLocal);
+  const startTime = formatHHMM(duty.start_at);
+  const endTime = formatHHMM(duty.end_at);
+  if (startLocal === endLocal) {
+    return `${startDDMM}, ${startTime} – ${endTime}`;
+  }
+  return `${startDDMM} ${startTime} – ${endDDMM} ${endTime}`;
+}
+
+const cardBase =
+  "grid grid-cols-1 gap-y-0.5 items-baseline rounded-lg bg-surface px-2.5 py-2 border-l-[3px] shadow-sm min-h-0 pr-12 relative";
+const borderByType = {
+  duty: "border-l-duty",
+  unavailable: "border-l-unavailable",
+  vacation: "border-l-vacation",
+} as const;
+
+/**
+ * Renders a single duty card. If duty has phone or username, wraps in a flip card
+ * (front: type, name, time + "Contacts" button; back: name, ContactLinks, "Back" button).
+ */
+export function DutyTimelineCard({
+  duty,
+  isCurrent,
+  isFlipped,
+  onFlipChange,
+}: DutyTimelineCardProps) {
+  const { t } = useTranslation();
+  const [localFlipped, setLocalFlipped] = useState(false);
+  const frontBtnRef = useRef<HTMLButtonElement>(null);
+  const backBtnRef = useRef<HTMLButtonElement>(null);
+  const hasContacts = Boolean(
+    (duty.phone && String(duty.phone).trim()) ||
+      (duty.username && String(duty.username).trim())
+  );
+  const typeLabel = isCurrent
+    ? t("duty.now_on_duty")
+    : t(`event_type.${duty.event_type || "duty"}`);
+  const timeStr = useMemo(() => buildTimeStr(duty), [duty]);
+  const eventType = (duty.event_type || "duty") as keyof typeof borderByType;
+  const borderClass = isCurrent ? "border-l-today" : borderByType[eventType] ?? "border-l-duty";
+
+  const isControlled = onFlipChange != null;
+  const flipped = isControlled ? (isFlipped ?? false) : localFlipped;
+
+  const handleFlipToBack = () => {
+    if (isControlled) {
+      onFlipChange?.(true);
+    } else {
+      setLocalFlipped(true);
+    }
+    setTimeout(() => backBtnRef.current?.focus(), 310);
+  };
+
+  const handleFlipToFront = () => {
+    if (isControlled) {
+      onFlipChange?.(false);
+    } else {
+      setLocalFlipped(false);
+    }
+    setTimeout(() => frontBtnRef.current?.focus(), 310);
+  };
+
+  if (!hasContacts) {
+    return (
+      <div
+        className={cn(
+          cardBase,
+          borderClass,
+          isCurrent && "bg-[var(--surface-today-tint)]"
+        )}
+      >
+        <span className="text-xs text-muted row-start-1">{typeLabel}</span>
+        <span
+          className="font-semibold min-w-0 row-start-2 whitespace-nowrap overflow-hidden text-ellipsis"
+          title={duty.full_name ?? undefined}
+        >
+          {duty.full_name}
+        </span>
+        <span className="text-[0.8rem] text-muted row-start-3">{timeStr}</span>
+      </div>
+    );
+  }
+
+  return (
+    <div className="duty-flip-card relative min-h-0 overflow-hidden rounded-lg">
+      <div
+        className="duty-flip-inner relative min-h-0 transition-transform duration-300 motion-reduce:duration-[0.01ms]"
+        style={{
+          transformStyle: "preserve-3d",
+          transform: flipped ? "rotateY(180deg)" : "none",
+        }}
+      >
+        {/* Front */}
+        <div
+          className={cn(
+            cardBase,
+            borderClass,
+            isCurrent && "bg-[var(--surface-today-tint)]",
+            "duty-flip-front"
+          )}
+        >
+          <span className="text-xs text-muted row-start-1">{typeLabel}</span>
+          <span
+            className="font-semibold min-w-0 row-start-2 whitespace-nowrap overflow-hidden text-ellipsis"
+            title={duty.full_name ?? undefined}
+          >
+            {duty.full_name}
+          </span>
+          <span className="text-[0.8rem] text-muted row-start-3">{timeStr}</span>
+          <Button
+            ref={frontBtnRef}
+            type="button"
+            variant="ghost"
+            size="icon"
+            className="absolute right-2 top-1/2 -translate-y-1/2 size-9 rounded-full bg-surface text-accent hover:bg-accent/20"
+            aria-label={t("contact.show")}
+            onClick={handleFlipToBack}
+          >
+            <Phone className="size-[18px]" aria-hidden />
+          </Button>
+        </div>
+        {/* Back */}
+        <div
+          className={cn(
+            cardBase,
+            borderClass,
+            isCurrent && "bg-[var(--surface-today-tint)]",
+            "duty-flip-back"
+          )}
+        >
+          <span
+            className="font-semibold min-w-0 row-start-1 whitespace-nowrap overflow-hidden text-ellipsis"
+            title={duty.full_name ?? undefined}
+          >
+            {duty.full_name}
+          </span>
+          <div className="row-start-2 mt-1">
+            <ContactLinks
+              phone={duty.phone}
+              username={duty.username}
+              layout="inline"
+              showLabels={false}
+            />
+          </div>
+          <Button
+            ref={backBtnRef}
+            type="button"
+            variant="ghost"
+            size="icon"
+            className="absolute right-2 top-1/2 -translate-y-1/2 size-9 rounded-full bg-surface text-accent hover:bg-accent/20"
+            aria-label={t("contact.back")}
+            onClick={handleFlipToFront}
+          >
+            <ArrowLeft className="size-[18px]" aria-hidden />
+          </Button>
+        </div>
+      </div>
+    </div>
+  );
+}
--- a/webapp-next/src/components/duty/index.ts
+++ b/webapp-next/src/components/duty/index.ts
@@ -0,0 +1,10 @@
+/**
+ * Duty list and timeline components.
+ */
+
+export { DutyList } from "./DutyList";
+export { DutyTimelineCard } from "./DutyTimelineCard";
+export { DutyItem } from "./DutyItem";
+export type { DutyListProps } from "./DutyList";
+export type { DutyTimelineCardProps } from "./DutyTimelineCard";
+export type { DutyItemProps } from "./DutyItem";
--- a/webapp-next/src/components/providers/TelegramProvider.tsx
+++ b/webapp-next/src/components/providers/TelegramProvider.tsx
@@ -0,0 +1,46 @@
+"use client";
+
+import { useEffect } from "react";
+import {
+  init,
+  mountMiniAppSync,
+  mountThemeParamsSync,
+  bindThemeParamsCssVars,
+} from "@telegram-apps/sdk-react";
+import { fixSurfaceContrast } from "@/hooks/use-telegram-theme";
+
+/**
+ * Wraps the app with Telegram Mini App SDK initialization.
+ * Calls init(acceptCustomStyles), mounts theme params (binds --tg-theme-* CSS vars),
+ * and mounts the mini app. Does not call ready() here — the app calls
+ * callMiniAppReadyOnce() from lib/telegram-ready when the first visible screen
+ * has finished loading, so Telegram keeps its native loading animation until then.
+ * Theme is set before first paint by the inline script in layout.tsx (URL hash);
+ * useTelegramTheme() in the app handles ongoing theme changes.
+ */
+export function TelegramProvider({
+  children,
+}: {
+  children: React.ReactNode;
+}) {
+  useEffect(() => {
+    const cleanup = init({ acceptCustomStyles: true });
+
+    if (mountThemeParamsSync.isAvailable()) {
+      mountThemeParamsSync();
+    }
+    if (bindThemeParamsCssVars.isAvailable()) {
+      bindThemeParamsCssVars();
+    }
+    fixSurfaceContrast();
+    void document.documentElement.offsetHeight;
+
+    if (mountMiniAppSync.isAvailable()) {
+      mountMiniAppSync();
+    }
+
+    return cleanup;
+  }, []);
+
+  return <>{children}</>;
+}
--- a/webapp-next/src/components/states/AccessDenied.test.tsx
+++ b/webapp-next/src/components/states/AccessDenied.test.tsx
@@ -0,0 +1,24 @@
+/**
+ * Unit tests for AccessDenied. Ported from webapp/js/ui.test.js showAccessDenied.
+ */
+
+import { describe, it, expect, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { AccessDenied } from "./AccessDenied";
+import { resetAppStore } from "@/test/test-utils";
+
+describe("AccessDenied", () => {
+  beforeEach(() => {
+    resetAppStore();
+  });
+
+  it("renders translated access denied message", () => {
+    render(<AccessDenied serverDetail={null} />);
+    expect(screen.getByText(/Access denied|Доступ запрещён/i)).toBeInTheDocument();
+  });
+
+  it("appends serverDetail when provided", () => {
+    render(<AccessDenied serverDetail="Custom 403 message" />);
+    expect(screen.getByText("Custom 403 message")).toBeInTheDocument();
+  });
+});
--- a/webapp-next/src/components/states/AccessDenied.tsx
+++ b/webapp-next/src/components/states/AccessDenied.tsx
@@ -0,0 +1,46 @@
+/**
+ * Access denied state: message and optional server detail.
+ * Ported from webapp/js/ui.js showAccessDenied and states.css .access-denied.
+ */
+
+"use client";
+
+import { useTranslation } from "@/i18n/use-translation";
+import { cn } from "@/lib/utils";
+
+export interface AccessDeniedProps {
+  /** Optional detail from API 403 response, shown below the main message. */
+  serverDetail?: string | null;
+  /** Optional class for the container. */
+  className?: string;
+}
+
+/**
+ * Displays access denied message; optional second paragraph for server detail.
+ */
+export function AccessDenied({ serverDetail, className }: AccessDeniedProps) {
+  const { t } = useTranslation();
+  const hasDetail = Boolean(serverDetail && String(serverDetail).trim());
+
+  return (
+    <div
+      className={cn(
+        "rounded-xl bg-surface py-6 px-4 my-3 text-center text-muted-foreground shadow-sm transition-opacity duration-200",
+        className
+      )}
+      role="alert"
+    >
+      <p className="m-0 mb-2 font-semibold text-error">
+        {t("access_denied")}
+      </p>
+      {hasDetail && (
+        <p className="mt-2 m-0 text-sm text-muted">
+          {serverDetail}
+        </p>
+      )}
+      <p className="mt-2 m-0 text-sm text-muted">
+        {t("access_denied.hint")}
+      </p>
+    </div>
+  );
+}
--- a/webapp-next/src/components/states/ErrorState.test.tsx
+++ b/webapp-next/src/components/states/ErrorState.test.tsx
@@ -0,0 +1,26 @@
+/**
+ * Unit tests for ErrorState. Ported from webapp/js/ui.test.js showError.
+ */
+
+import { describe, it, expect, vi, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { ErrorState } from "./ErrorState";
+import { resetAppStore } from "@/test/test-utils";
+
+describe("ErrorState", () => {
+  beforeEach(() => resetAppStore());
+
+  it("renders error message", () => {
+    render(<ErrorState message="Network error" onRetry={undefined} />);
+    expect(screen.getByText("Network error")).toBeInTheDocument();
+  });
+
+  it("renders Retry button when onRetry provided", () => {
+    const onRetry = vi.fn();
+    render(<ErrorState message="Fail" onRetry={onRetry} />);
+    const retry = screen.getByRole("button", { name: /retry|повторить/i });
+    expect(retry).toBeInTheDocument();
+    retry.click();
+    expect(onRetry).toHaveBeenCalled();
+  });
+});
--- a/webapp-next/src/components/states/ErrorState.tsx
+++ b/webapp-next/src/components/states/ErrorState.tsx
@@ -0,0 +1,75 @@
+/**
+ * Error state: warning icon, message, and optional Retry button.
+ * Ported from webapp/js/ui.js showError and states.css .error.
+ */
+
+"use client";
+
+import { useTranslation } from "@/i18n/use-translation";
+import { Button } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+
+export interface ErrorStateProps {
+  /** Error message to display. If not provided, uses generic i18n message. */
+  message?: string | null;
+  /** Optional retry callback; when provided, a Retry button is shown. */
+  onRetry?: (() => void) | null;
+  /** Optional class for the container. */
+  className?: string;
+}
+
+/** Warning triangle icon 24×24 for error state. */
+function ErrorIcon({ className }: { className?: string }) {
+  return (
+    <svg
+      xmlns="http://www.w3.org/2000/svg"
+      width="24"
+      height="24"
+      viewBox="0 0 24 24"
+      fill="none"
+      stroke="currentColor"
+      strokeWidth="2"
+      strokeLinecap="round"
+      strokeLinejoin="round"
+      className={cn("shrink-0 text-error", className)}
+      aria-hidden
+    >
+      <path d="M10.29 3.86L1.82 18a2 2 0 0 0 1.71 3h16.94a2 2 0 0 0 1.71-3L13.71 3.86a2 2 0 0 0-3.42 0z" />
+      <line x1="12" y1="9" x2="12" y2="13" />
+      <line x1="12" y1="17" x2="12.01" y2="17" />
+    </svg>
+  );
+}
+
+/**
+ * Displays an error message with optional Retry button.
+ */
+export function ErrorState({ message, onRetry, className }: ErrorStateProps) {
+  const { t } = useTranslation();
+  const displayMessage =
+    message && String(message).trim() ? message : t("error_generic");
+
+  return (
+    <div
+      className={cn(
+        "flex flex-col items-center gap-3 rounded-xl bg-surface py-5 px-4 my-3 text-center text-error transition-opacity duration-200",
+        className
+      )}
+      role="alert"
+    >
+      <ErrorIcon />
+      <p className="m-0 text-sm font-medium">{displayMessage}</p>
+      {typeof onRetry === "function" && (
+        <Button
+          type="button"
+          variant="default"
+          size="sm"
+          className="mt-1 bg-primary text-primary-foreground hover:opacity-90 focus-visible:outline-2 focus-visible:outline-accent focus-visible:outline-offset-2"
+          onClick={onRetry}
+        >
+          {t("error.retry")}
+        </Button>
+      )}
+    </div>
+  );
+}
--- a/webapp-next/src/components/states/LoadingState.test.tsx
+++ b/webapp-next/src/components/states/LoadingState.test.tsx
@@ -0,0 +1,17 @@
+/**
+ * Unit tests for LoadingState. Ported from webapp/js/ui.test.js (loading).
+ */
+
+import { describe, it, expect, beforeEach } from "vitest";
+import { render, screen } from "@testing-library/react";
+import { LoadingState } from "./LoadingState";
+import { resetAppStore } from "@/test/test-utils";
+
+describe("LoadingState", () => {
+  beforeEach(() => resetAppStore());
+
+  it("renders loading text", () => {
+    render(<LoadingState />);
+    expect(screen.getByText(/Loading/i)).toBeInTheDocument();
+  });
+});
--- a/webapp-next/src/components/states/LoadingState.tsx
+++ b/webapp-next/src/components/states/LoadingState.tsx
@@ -0,0 +1,71 @@
+/**
+ * Loading state: spinner and translated "Loading…" text.
+ * Optionally wraps content in a container for calendar placeholder use.
+ * Ported from webapp CSS states.css .loading and index.html loading element.
+ */
+
+"use client";
+
+import { useTranslation } from "@/i18n/use-translation";
+import { cn } from "@/lib/utils";
+
+export interface LoadingStateProps {
+  /** Optional class for the container. */
+  className?: string;
+  /** If true, render a compact skeleton-style placeholder (e.g. for calendar area). */
+  asPlaceholder?: boolean;
+}
+
+/**
+ * Spinner icon matching original .loading__spinner (accent color, reduced-motion safe).
+ */
+function LoadingSpinner({ className }: { className?: string }) {
+  return (
+    <span
+      className={cn(
+        "block size-5 shrink-0 rounded-full border-2 border-transparent border-t-accent motion-reduce:animate-none",
+        "animate-spin",
+        className
+      )}
+      aria-hidden
+    />
+  );
+}
+
+/**
+ * Full loading view: flex center, spinner + "Loading…" text.
+ */
+export function LoadingState({ className, asPlaceholder }: LoadingStateProps) {
+  const { t } = useTranslation();
+
+  if (asPlaceholder) {
+    return (
+      <div
+        className={cn(
+          "flex min-h-[120px] items-center justify-center rounded-lg bg-muted/30",
+          className
+        )}
+        role="status"
+        aria-live="polite"
+        aria-label={t("loading")}
+      >
+        <LoadingSpinner />
+      </div>
+    );
+  }
+
+  return (
+    <div
+      className={cn(
+        "flex items-center justify-center gap-2.5 py-3 text-center text-muted-foreground",
+        className
+      )}
+      role="status"
+      aria-live="polite"
+      aria-label={t("loading")}
+    >
+      <LoadingSpinner />
+      <span className="loading__text">{t("loading")}</span>
+    </div>
+  );
+}
--- a/webapp-next/src/components/states/index.ts
+++ b/webapp-next/src/components/states/index.ts
@@ -0,0 +1,7 @@
+/**
+ * State components: loading, error, access denied.
+ */
+
+export { LoadingState } from "./LoadingState";
+export { ErrorState } from "./ErrorState";
+export { AccessDenied } from "./AccessDenied";
--- a/webapp-next/src/components/ui/badge.tsx
+++ b/webapp-next/src/components/ui/badge.tsx
@@ -0,0 +1,48 @@
+import * as React from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+import { Slot } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+const badgeVariants = cva(
+  "inline-flex w-fit shrink-0 items-center justify-center gap-1 overflow-hidden rounded-full border border-transparent px-2 py-0.5 text-xs font-medium whitespace-nowrap transition-[color,box-shadow] focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 [&>svg]:pointer-events-none [&>svg]:size-3",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground [a&]:hover:bg-primary/90",
+        secondary:
+          "bg-secondary text-secondary-foreground [a&]:hover:bg-secondary/90",
+        destructive:
+          "bg-destructive text-white focus-visible:ring-destructive/20 dark:bg-destructive/60 dark:focus-visible:ring-destructive/40 [a&]:hover:bg-destructive/90",
+        outline:
+          "border-border text-foreground [a&]:hover:bg-accent [a&]:hover:text-accent-foreground",
+        ghost: "[a&]:hover:bg-accent [a&]:hover:text-accent-foreground",
+        link: "text-primary underline-offset-4 [a&]:hover:underline",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+    },
+  }
+)
+
+function Badge({
+  className,
+  variant = "default",
+  asChild = false,
+  ...props
+}: React.ComponentProps<"span"> &
+  VariantProps<typeof badgeVariants> & { asChild?: boolean }) {
+  const Comp = asChild ? Slot.Root : "span"
+
+  return (
+    <Comp
+      data-slot="badge"
+      data-variant={variant}
+      className={cn(badgeVariants({ variant }), className)}
+      {...props}
+    />
+  )
+}
+
+export { Badge, badgeVariants }
--- a/webapp-next/src/components/ui/button.tsx
+++ b/webapp-next/src/components/ui/button.tsx
@@ -0,0 +1,64 @@
+import * as React from "react"
+import { cva, type VariantProps } from "class-variance-authority"
+import { Slot } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+const buttonVariants = cva(
+  "inline-flex shrink-0 items-center justify-center gap-2 rounded-md text-sm font-medium whitespace-nowrap transition-all outline-none focus-visible:border-ring focus-visible:ring-[3px] focus-visible:ring-ring/50 disabled:pointer-events-none disabled:opacity-50 aria-invalid:border-destructive aria-invalid:ring-destructive/20 dark:aria-invalid:ring-destructive/40 [&_svg]:pointer-events-none [&_svg]:shrink-0 [&_svg:not([class*='size-'])]:size-4",
+  {
+    variants: {
+      variant: {
+        default: "bg-primary text-primary-foreground hover:bg-primary/90",
+        destructive:
+          "bg-destructive text-white hover:bg-destructive/90 focus-visible:ring-destructive/20 dark:bg-destructive/60 dark:focus-visible:ring-destructive/40",
+        outline:
+          "border bg-background shadow-xs hover:bg-accent hover:text-accent-foreground dark:border-input dark:bg-input/30 dark:hover:bg-input/50",
+        secondary:
+          "bg-secondary text-secondary-foreground hover:bg-secondary/80",
+        ghost:
+          "hover:bg-accent hover:text-accent-foreground dark:hover:bg-accent/50",
+        link: "text-primary underline-offset-4 hover:underline",
+      },
+      size: {
+        default: "h-9 px-4 py-2 has-[>svg]:px-3",
+        xs: "h-6 gap-1 rounded-md px-2 text-xs has-[>svg]:px-1.5 [&_svg:not([class*='size-'])]:size-3",
+        sm: "h-8 gap-1.5 rounded-md px-3 has-[>svg]:px-2.5",
+        lg: "h-10 rounded-md px-6 has-[>svg]:px-4",
+        icon: "size-9",
+        "icon-xs": "size-6 rounded-md [&_svg:not([class*='size-'])]:size-3",
+        "icon-sm": "size-8",
+        "icon-lg": "size-10",
+      },
+    },
+    defaultVariants: {
+      variant: "default",
+      size: "default",
+    },
+  }
+)
+
+function Button({
+  className,
+  variant = "default",
+  size = "default",
+  asChild = false,
+  ...props
+}: React.ComponentProps<"button"> &
+  VariantProps<typeof buttonVariants> & {
+    asChild?: boolean
+  }) {
+  const Comp = asChild ? Slot.Root : "button"
+
+  return (
+    <Comp
+      data-slot="button"
+      data-variant={variant}
+      data-size={size}
+      className={cn(buttonVariants({ variant, size, className }))}
+      {...props}
+    />
+  )
+}
+
+export { Button, buttonVariants }
--- a/webapp-next/src/components/ui/card.tsx
+++ b/webapp-next/src/components/ui/card.tsx
@@ -0,0 +1,92 @@
+import * as React from "react"
+
+import { cn } from "@/lib/utils"
+
+function Card({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card"
+      className={cn(
+        "flex flex-col gap-6 rounded-xl border bg-card py-6 text-card-foreground shadow-sm",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-header"
+      className={cn(
+        "@container/card-header grid auto-rows-min grid-rows-[auto_auto] items-start gap-2 px-6 has-data-[slot=card-action]:grid-cols-[1fr_auto] [.border-b]:pb-6",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardTitle({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-title"
+      className={cn("leading-none font-semibold", className)}
+      {...props}
+    />
+  )
+}
+
+function CardDescription({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-description"
+      className={cn("text-sm text-muted-foreground", className)}
+      {...props}
+    />
+  )
+}
+
+function CardAction({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-action"
+      className={cn(
+        "col-start-2 row-span-2 row-start-1 self-start justify-self-end",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function CardContent({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-content"
+      className={cn("px-6", className)}
+      {...props}
+    />
+  )
+}
+
+function CardFooter({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="card-footer"
+      className={cn("flex items-center px-6 [.border-t]:pt-6", className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  Card,
+  CardHeader,
+  CardFooter,
+  CardTitle,
+  CardAction,
+  CardDescription,
+  CardContent,
+}
--- a/webapp-next/src/components/ui/popover.tsx
+++ b/webapp-next/src/components/ui/popover.tsx
@@ -0,0 +1,89 @@
+"use client"
+
+import * as React from "react"
+import { Popover as PopoverPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function Popover({
+  ...props
+}: React.ComponentProps<typeof PopoverPrimitive.Root>) {
+  return <PopoverPrimitive.Root data-slot="popover" {...props} />
+}
+
+function PopoverTrigger({
+  ...props
+}: React.ComponentProps<typeof PopoverPrimitive.Trigger>) {
+  return <PopoverPrimitive.Trigger data-slot="popover-trigger" {...props} />
+}
+
+function PopoverContent({
+  className,
+  align = "center",
+  sideOffset = 4,
+  ...props
+}: React.ComponentProps<typeof PopoverPrimitive.Content>) {
+  return (
+    <PopoverPrimitive.Portal>
+      <PopoverPrimitive.Content
+        data-slot="popover-content"
+        align={align}
+        sideOffset={sideOffset}
+        className={cn(
+          "z-50 w-72 origin-(--radix-popover-content-transform-origin) rounded-md border bg-popover p-4 text-popover-foreground shadow-md outline-hidden data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95 data-[state=open]:animate-in data-[state=open]:fade-in-0 data-[state=open]:zoom-in-95",
+          className
+        )}
+        {...props}
+      />
+    </PopoverPrimitive.Portal>
+  )
+}
+
+function PopoverAnchor({
+  ...props
+}: React.ComponentProps<typeof PopoverPrimitive.Anchor>) {
+  return <PopoverPrimitive.Anchor data-slot="popover-anchor" {...props} />
+}
+
+function PopoverHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="popover-header"
+      className={cn("flex flex-col gap-1 text-sm", className)}
+      {...props}
+    />
+  )
+}
+
+function PopoverTitle({ className, ...props }: React.ComponentProps<"h2">) {
+  return (
+    <div
+      data-slot="popover-title"
+      className={cn("font-medium", className)}
+      {...props}
+    />
+  )
+}
+
+function PopoverDescription({
+  className,
+  ...props
+}: React.ComponentProps<"p">) {
+  return (
+    <p
+      data-slot="popover-description"
+      className={cn("text-muted-foreground", className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  Popover,
+  PopoverTrigger,
+  PopoverContent,
+  PopoverAnchor,
+  PopoverHeader,
+  PopoverTitle,
+  PopoverDescription,
+}
--- a/webapp-next/src/components/ui/sheet.tsx
+++ b/webapp-next/src/components/ui/sheet.tsx
@@ -0,0 +1,163 @@
+"use client"
+
+import * as React from "react"
+import { XIcon } from "lucide-react"
+import { Dialog as SheetPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function Sheet({ ...props }: React.ComponentProps<typeof SheetPrimitive.Root>) {
+  return <SheetPrimitive.Root data-slot="sheet" {...props} />
+}
+
+function SheetTrigger({
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Trigger>) {
+  return <SheetPrimitive.Trigger data-slot="sheet-trigger" {...props} />
+}
+
+function SheetClose({
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Close>) {
+  return <SheetPrimitive.Close data-slot="sheet-close" {...props} />
+}
+
+function SheetPortal({
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Portal>) {
+  return <SheetPrimitive.Portal data-slot="sheet-portal" {...props} />
+}
+
+function SheetOverlay({
+  className,
+  forceMount,
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Overlay>) {
+  return (
+    <SheetPrimitive.Overlay
+      data-slot="sheet-overlay"
+      forceMount={forceMount}
+      className={cn(
+        "fixed inset-0 z-50 bg-black/50 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:duration-300 data-[state=closed]:ease-out data-[state=open]:animate-in data-[state=open]:fade-in-0",
+        className
+      )}
+      {...props}
+    />
+  )
+}
+
+function SheetContent({
+  className,
+  children,
+  side = "right",
+  showCloseButton = true,
+  onCloseAnimationEnd,
+  onAnimationEnd,
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Content> & {
+  side?: "top" | "right" | "bottom" | "left"
+  showCloseButton?: boolean
+  /** When provided, content and overlay stay mounted until close animation ends (forceMount). */
+  onCloseAnimationEnd?: () => void
+}) {
+  const useForceMount = Boolean(onCloseAnimationEnd)
+
+  const handleAnimationEnd = React.useCallback(
+    (e: React.AnimationEvent<HTMLDivElement>) => {
+      onAnimationEnd?.(e)
+      if (e.currentTarget.getAttribute("data-state") === "closed") {
+        onCloseAnimationEnd?.()
+      }
+    },
+    [onAnimationEnd, onCloseAnimationEnd]
+  )
+
+  return (
+    <SheetPortal>
+      <SheetOverlay forceMount={useForceMount ? true : undefined} />
+      <SheetPrimitive.Content
+        data-slot="sheet-content"
+        forceMount={useForceMount ? true : undefined}
+        onAnimationEnd={handleAnimationEnd}
+        className={cn(
+          "fixed z-50 flex flex-col gap-4 bg-background shadow-lg data-[state=closed]:animate-out data-[state=closed]:duration-300 data-[state=closed]:ease-out data-[state=open]:animate-in data-[state=open]:duration-300",
+          side === "right" &&
+            "inset-y-0 right-0 h-full w-3/4 border-l data-[state=closed]:slide-out-to-right data-[state=open]:slide-in-from-right sm:max-w-sm",
+          side === "left" &&
+            "inset-y-0 left-0 h-full w-3/4 border-r data-[state=closed]:slide-out-to-left data-[state=open]:slide-in-from-left sm:max-w-sm",
+          side === "top" &&
+            "inset-x-0 top-0 h-auto border-b data-[state=closed]:slide-out-to-top data-[state=open]:slide-in-from-top",
+          side === "bottom" &&
+            "inset-x-0 bottom-0 h-auto border-t data-[state=closed]:slide-out-to-bottom data-[state=open]:slide-in-from-bottom",
+          className
+        )}
+        {...props}
+      >
+        {children}
+        {showCloseButton && (
+          <SheetPrimitive.Close className="absolute top-4 right-4 rounded-xs opacity-70 ring-offset-background transition-opacity hover:opacity-100 focus:ring-2 focus:ring-ring focus:ring-offset-2 focus:outline-hidden disabled:pointer-events-none data-[state=open]:bg-secondary">
+            <XIcon className="size-4" />
+            <span className="sr-only">Close</span>
+          </SheetPrimitive.Close>
+        )}
+      </SheetPrimitive.Content>
+    </SheetPortal>
+  )
+}
+
+function SheetHeader({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sheet-header"
+      className={cn("flex flex-col gap-1.5 p-4", className)}
+      {...props}
+    />
+  )
+}
+
+function SheetFooter({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="sheet-footer"
+      className={cn("mt-auto flex flex-col gap-2 p-4", className)}
+      {...props}
+    />
+  )
+}
+
+function SheetTitle({
+  className,
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Title>) {
+  return (
+    <SheetPrimitive.Title
+      data-slot="sheet-title"
+      className={cn("font-semibold text-foreground", className)}
+      {...props}
+    />
+  )
+}
+
+function SheetDescription({
+  className,
+  ...props
+}: React.ComponentProps<typeof SheetPrimitive.Description>) {
+  return (
+    <SheetPrimitive.Description
+      data-slot="sheet-description"
+      className={cn("text-sm text-muted-foreground", className)}
+      {...props}
+    />
+  )
+}
+
+export {
+  Sheet,
+  SheetTrigger,
+  SheetClose,
+  SheetContent,
+  SheetHeader,
+  SheetFooter,
+  SheetTitle,
+  SheetDescription,
+}
--- a/webapp-next/src/components/ui/skeleton.tsx
+++ b/webapp-next/src/components/ui/skeleton.tsx
@@ -0,0 +1,13 @@
+import { cn } from "@/lib/utils"
+
+function Skeleton({ className, ...props }: React.ComponentProps<"div">) {
+  return (
+    <div
+      data-slot="skeleton"
+      className={cn("animate-pulse rounded-md bg-muted", className)}
+      {...props}
+    />
+  )
+}
+
+export { Skeleton }
--- a/webapp-next/src/components/ui/tooltip.tsx
+++ b/webapp-next/src/components/ui/tooltip.tsx
@@ -0,0 +1,57 @@
+"use client"
+
+import * as React from "react"
+import { Tooltip as TooltipPrimitive } from "radix-ui"
+
+import { cn } from "@/lib/utils"
+
+function TooltipProvider({
+  delayDuration = 0,
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Provider>) {
+  return (
+    <TooltipPrimitive.Provider
+      data-slot="tooltip-provider"
+      delayDuration={delayDuration}
+      {...props}
+    />
+  )
+}
+
+function Tooltip({
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Root>) {
+  return <TooltipPrimitive.Root data-slot="tooltip" {...props} />
+}
+
+function TooltipTrigger({
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Trigger>) {
+  return <TooltipPrimitive.Trigger data-slot="tooltip-trigger" {...props} />
+}
+
+function TooltipContent({
+  className,
+  sideOffset = 0,
+  children,
+  ...props
+}: React.ComponentProps<typeof TooltipPrimitive.Content>) {
+  return (
+    <TooltipPrimitive.Portal>
+      <TooltipPrimitive.Content
+        data-slot="tooltip-content"
+        sideOffset={sideOffset}
+        className={cn(
+          "z-50 w-fit max-w-[min(98vw,380px)] origin-(--radix-tooltip-content-transform-origin) animate-in rounded-lg bg-surface px-3 py-2 text-[0.85rem] leading-snug text-[var(--text)] shadow-[0_4px_12px_rgba(0,0,0,0.4)] fade-in-0 zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2 data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=closed]:zoom-out-95",
+          className
+        )}
+        {...props}
+      >
+        {children}
+        <TooltipPrimitive.Arrow className="z-50 size-2.5 translate-y-[calc(-50%_-_2px)] rotate-45 rounded-[2px] bg-surface fill-surface" />
+      </TooltipPrimitive.Content>
+    </TooltipPrimitive.Portal>
+  )
+}
+
+export { Tooltip, TooltipTrigger, TooltipContent, TooltipProvider }
--- a/webapp-next/src/hooks/use-app-init.ts
+++ b/webapp-next/src/hooks/use-app-init.ts
@@ -0,0 +1,63 @@
+/**
+ * Application initialization: language sync, access-denied logic, deep link routing.
+ * Runs effects that depend on Telegram auth (isAllowed, startParam); caller provides those.
+ */
+
+"use client";
+
+import { useEffect } from "react";
+import { useAppStore } from "@/store/app-store";
+import { getLang } from "@/i18n/messages";
+import { useTranslation } from "@/i18n/use-translation";
+import { RETRY_DELAY_MS } from "@/lib/constants";
+
+export interface UseAppInitParams {
+  /** Whether the user is allowed (localhost or has valid initData). */
+  isAllowed: boolean;
+  /** Telegram Mini App start_param (e.g. "duty" for current duty deep link). */
+  startParam: string | undefined;
+}
+
+/**
+ * Syncs language from backend config, applies document lang/title, handles access denied
+ * when not allowed, and routes to current duty view when opened via startParam=duty.
+ */
+export function useAppInit({ isAllowed, startParam }: UseAppInitParams): void {
+  const setLang = useAppStore((s) => s.setLang);
+  const lang = useAppStore((s) => s.lang);
+  const setAccessDenied = useAppStore((s) => s.setAccessDenied);
+  const setLoading = useAppStore((s) => s.setLoading);
+  const setCurrentView = useAppStore((s) => s.setCurrentView);
+  const { t } = useTranslation();
+
+  // Sync lang from backend config (window.__DT_LANG).
+  useEffect(() => {
+    if (typeof window === "undefined") return;
+    setLang(getLang());
+  }, [setLang]);
+
+  // Apply lang to document (title and html lang) for accessibility and i18n.
+  useEffect(() => {
+    if (typeof document === "undefined") return;
+    document.documentElement.lang = lang;
+    document.title = t("app.title");
+  }, [lang, t]);
+
+  // When not allowed (no initData and not localhost), show access denied after delay.
+  useEffect(() => {
+    if (isAllowed) {
+      setAccessDenied(false);
+      return;
+    }
+    const id = setTimeout(() => {
+      setAccessDenied(true);
+      setLoading(false);
+    }, RETRY_DELAY_MS);
+    return () => clearTimeout(id);
+  }, [isAllowed, setAccessDenied, setLoading]);
+
+  // When opened via deep link startParam=duty, show current duty view first.
+  useEffect(() => {
+    if (startParam === "duty") setCurrentView("currentDuty");
+  }, [startParam, setCurrentView]);
+}
--- a/webapp-next/src/hooks/use-auto-refresh.ts
+++ b/webapp-next/src/hooks/use-auto-refresh.ts
@@ -0,0 +1,29 @@
+/**
+ * 60-second interval to refresh duty list when viewing the current month.
+ * Replaces state.todayRefreshInterval from webapp/js/main.js.
+ */
+
+"use client";
+
+import { useEffect, useRef } from "react";
+
+const AUTO_REFRESH_INTERVAL_MS = 60000;
+
+/**
+ * When isCurrentMonth is true, calls refresh() immediately, then every 60 seconds.
+ * When isCurrentMonth becomes false or on unmount, the interval is cleared.
+ */
+export function useAutoRefresh(
+  refresh: () => void,
+  isCurrentMonth: boolean
+): void {
+  const refreshRef = useRef(refresh);
+  refreshRef.current = refresh;
+
+  useEffect(() => {
+    if (!isCurrentMonth) return;
+    refreshRef.current();
+    const id = setInterval(() => refreshRef.current(), AUTO_REFRESH_INTERVAL_MS);
+    return () => clearInterval(id);
+  }, [isCurrentMonth]);
+}
--- a/webapp-next/src/hooks/use-media-query.ts
+++ b/webapp-next/src/hooks/use-media-query.ts
@@ -0,0 +1,34 @@
+/**
+ * Returns true when the given media query matches (e.g. min-width: 640px for desktop).
+ * Used to switch DayDetail between Popover (desktop) and Sheet (mobile).
+ */
+
+"use client";
+
+import { useState, useEffect } from "react";
+
+/**
+ * Match a media query string (e.g. "(min-width: 640px)").
+ * Returns undefined during SSR to avoid hydration mismatch; client gets the real value.
+ */
+export function useMediaQuery(query: string): boolean | undefined {
+  const [matches, setMatches] = useState<boolean | undefined>(() =>
+    typeof window === "undefined" ? undefined : window.matchMedia(query).matches
+  );
+
+  useEffect(() => {
+    if (typeof window === "undefined") return;
+    const mq = window.matchMedia(query);
+    const handler = (e: MediaQueryListEvent) => setMatches(e.matches);
+    setMatches(mq.matches);
+    mq.addEventListener("change", handler);
+    return () => mq.removeEventListener("change", handler);
+  }, [query]);
+
+  return matches;
+}
+
+/** True when viewport is at least 640px (desktop). Undefined during SSR. */
+export function useIsDesktop(): boolean | undefined {
+  return useMediaQuery("(min-width: 640px)");
+}
--- a/webapp-next/src/hooks/use-month-data.ts
+++ b/webapp-next/src/hooks/use-month-data.ts
@@ -0,0 +1,212 @@
+/**
+ * Fetches duties and calendar events for the current month. Handles loading, error,
+ * access denied, and retry after ACCESS_DENIED. Replaces loadMonth() from webapp/js/main.js.
+ */
+
+"use client";
+
+import { useEffect, useRef, useCallback } from "react";
+import { useAppStore } from "@/store/app-store";
+import { fetchDuties, fetchCalendarEvents, AccessDeniedError } from "@/lib/api";
+import {
+  firstDayOfMonth,
+  lastDayOfMonth,
+  getMonday,
+  localDateString,
+  dutyOverlapsLocalRange,
+} from "@/lib/date-utils";
+import { RETRY_AFTER_ACCESS_DENIED_MS, RETRY_AFTER_ERROR_MS, MAX_GENERAL_RETRIES } from "@/lib/constants";
+import { logger } from "@/lib/logger";
+import { translate } from "@/i18n/messages";
+
+export interface UseMonthDataOptions {
+  /** Telegram init data string for API auth. When undefined, no fetch (unless isLocalhost). */
+  initDataRaw: string | undefined;
+  /** When true, fetch runs for the current month. When false, no fetch (e.g. access not allowed). */
+  enabled: boolean;
+}
+
+/**
+ * Fetches duties and calendar events for the displayed month when enabled.
+ * When pendingMonth is set (user clicked next/prev), loads that month without clearing
+ * current data; on success updates currentMonth and data in one batch (no empty-frame flicker).
+ * Cancels in-flight request when month changes or component unmounts.
+ * On ACCESS_DENIED, shows access denied and retries once after RETRY_AFTER_ACCESS_DENIED_MS.
+ * Returns retry() to manually trigger a reload.
+ */
+export function useMonthData(options: UseMonthDataOptions): { retry: () => void } {
+  const { initDataRaw, enabled } = options;
+
+  const currentMonth = useAppStore((s) => s.currentMonth);
+  const pendingMonth = useAppStore((s) => s.pendingMonth);
+  const lang = useAppStore((s) => s.lang);
+
+  const abortRef = useRef<AbortController | null>(null);
+  const retryTimeoutRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+  const initDataRetriedRef = useRef(false);
+  const generalRetryCountRef = useRef(0);
+  const mountedRef = useRef(true);
+  const optionsRef = useRef({ initDataRaw, enabled, lang });
+  optionsRef.current = { initDataRaw, enabled, lang };
+
+  const loadRef = useRef<() => void>(() => {});
+
+  useEffect(() => {
+    return () => {
+      mountedRef.current = false;
+    };
+  }, []);
+
+  const load = useCallback(() => {
+    const { initDataRaw: initDataRawOpt, enabled: enabledOpt, lang: langOpt } = optionsRef.current;
+    if (!enabledOpt) {
+      useAppStore.getState().batchUpdate({ pendingMonth: null });
+      return;
+    }
+    const initData = initDataRawOpt ?? "";
+    if (!initData && typeof window !== "undefined") {
+      const h = window.location.hostname;
+      if (h !== "localhost" && h !== "127.0.0.1" && h !== "") {
+        useAppStore.getState().batchUpdate({ pendingMonth: null });
+        return;
+      }
+    }
+
+    const store = useAppStore.getState();
+    const pending = store.pendingMonth;
+    const monthToLoad = pending ?? store.currentMonth;
+    const monthKey = `${monthToLoad.getFullYear()}-${String(monthToLoad.getMonth() + 1).padStart(2, "0")}`;
+    const dataForMonthKey = store.dataForMonthKey;
+    const isDeferredSwitch = pending !== null;
+    const isNewMonth = !isDeferredSwitch && dataForMonthKey !== monthKey;
+
+    if (abortRef.current) abortRef.current.abort();
+    abortRef.current = new AbortController();
+    const signal = abortRef.current.signal;
+
+    store.batchUpdate({
+      accessDenied: false,
+      accessDeniedDetail: null,
+      loading: true,
+      error: null,
+      ...(isNewMonth
+        ? { duties: [], calendarEvents: [], dataForMonthKey: null }
+        : {}),
+    });
+
+    const first = firstDayOfMonth(monthToLoad);
+    const start = getMonday(first);
+    const gridEnd = new Date(start);
+    gridEnd.setDate(gridEnd.getDate() + 41);
+    const from = localDateString(start);
+    const to = localDateString(gridEnd);
+
+    const run = async () => {
+      try {
+        logger.debug("Loading month", from, to);
+        const [duties, events] = await Promise.all([
+          fetchDuties(from, to, initData, langOpt, signal),
+          fetchCalendarEvents(from, to, initData, langOpt, signal),
+        ]);
+
+        const last = lastDayOfMonth(monthToLoad);
+        const firstKey = localDateString(first);
+        const lastKey = localDateString(last);
+        const dutiesInMonth = duties.filter((d) =>
+          dutyOverlapsLocalRange(d, firstKey, lastKey)
+        );
+
+        const storeAfter = useAppStore.getState();
+        const switchedMonth =
+          storeAfter.currentMonth.getFullYear() !== monthToLoad.getFullYear() ||
+          storeAfter.currentMonth.getMonth() !== monthToLoad.getMonth();
+
+        useAppStore.getState().batchUpdate({
+          ...(switchedMonth
+            ? { currentMonth: new Date(monthToLoad.getFullYear(), monthToLoad.getMonth(), 1) }
+            : {}),
+          pendingMonth: null,
+          duties: dutiesInMonth,
+          calendarEvents: events,
+          dataForMonthKey: monthKey,
+          loading: false,
+          error: null,
+        });
+      } catch (e) {
+        if ((e as Error).name === "AbortError") {
+          useAppStore.getState().batchUpdate({
+            loading: false,
+            pendingMonth: null,
+          });
+          return;
+        }
+        if (e instanceof AccessDeniedError) {
+          logger.warn("Access denied in loadMonth", e.serverDetail);
+          useAppStore.getState().batchUpdate({
+            accessDenied: true,
+            accessDeniedDetail: e.serverDetail ?? null,
+            loading: false,
+            pendingMonth: null,
+          });
+          if (!initDataRetriedRef.current) {
+            initDataRetriedRef.current = true;
+            const timeoutId = setTimeout(() => {
+              if (mountedRef.current) loadRef.current();
+            }, RETRY_AFTER_ACCESS_DENIED_MS);
+            retryTimeoutRef.current = timeoutId;
+          }
+          return;
+        }
+        logger.error("Load month failed", e);
+        if (generalRetryCountRef.current < MAX_GENERAL_RETRIES && mountedRef.current) {
+          generalRetryCountRef.current++;
+          const timeoutId = setTimeout(() => {
+            if (mountedRef.current) loadRef.current();
+          }, RETRY_AFTER_ERROR_MS);
+          retryTimeoutRef.current = timeoutId;
+          return;
+        }
+        useAppStore.getState().batchUpdate({
+          error: translate(langOpt, "error_generic"),
+          loading: false,
+          pendingMonth: null,
+        });
+      }
+    };
+
+    run();
+  }, []);
+
+  loadRef.current = load;
+
+  useEffect(() => {
+    if (!enabled) return;
+    initDataRetriedRef.current = false;
+    generalRetryCountRef.current = 0;
+    load();
+    return () => {
+      if (retryTimeoutRef.current) {
+        clearTimeout(retryTimeoutRef.current);
+        retryTimeoutRef.current = null;
+      }
+      if (abortRef.current) abortRef.current.abort();
+      abortRef.current = null;
+    };
+  }, [enabled, load, currentMonth, pendingMonth, lang, initDataRaw]);
+
+  useEffect(() => {
+    if (!enabled) return;
+    const handleVisibility = () => {
+      if (document.visibilityState !== "visible") return;
+      const { duties, loading: isLoading, error: hasError } = useAppStore.getState();
+      if (duties.length === 0 && !isLoading && !hasError) {
+        generalRetryCountRef.current = 0;
+        loadRef.current();
+      }
+    };
+    document.addEventListener("visibilitychange", handleVisibility);
+    return () => document.removeEventListener("visibilitychange", handleVisibility);
+  }, [enabled]);
+
+  return { retry: load };
+}
--- a/webapp-next/src/hooks/use-sticky-scroll.ts
+++ b/webapp-next/src/hooks/use-sticky-scroll.ts
@@ -0,0 +1,44 @@
+/**
+ * Toggles an "is-scrolled" class on the sticky element when the user has scrolled.
+ * Replaces bindStickyScrollShadow from webapp/js/main.js.
+ */
+
+"use client";
+
+import { useEffect, useRef } from "react";
+
+const IS_SCROLLED_CLASS = "is-scrolled";
+
+/**
+ * Listens to window scroll and toggles the class "is-scrolled" on the given element
+ * when window.scrollY > 0. Uses passive scroll listener.
+ */
+export function useStickyScroll(
+  elementRef: React.RefObject<HTMLElement | null>
+): void {
+  const rafRef = useRef<number | null>(null);
+
+  useEffect(() => {
+    const el = elementRef.current;
+    if (!el) return;
+
+    const update = () => {
+      rafRef.current = null;
+      const scrolled = typeof window !== "undefined" && window.scrollY > 0;
+      el.classList.toggle(IS_SCROLLED_CLASS, scrolled);
+    };
+
+    const handleScroll = () => {
+      if (rafRef.current == null) {
+        rafRef.current = requestAnimationFrame(update);
+      }
+    };
+
+    update();
+    window.addEventListener("scroll", handleScroll, { passive: true });
+    return () => {
+      window.removeEventListener("scroll", handleScroll);
+      if (rafRef.current != null) cancelAnimationFrame(rafRef.current);
+    };
+  }, [elementRef]);
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Nikolay Tatarinov	119661628e	refactor: enhance styling and structure in DayDetailContent component All checks were successful CI / lint-and-test (push) Successful in 1m3s Details Docker Build and Release / build-and-push (push) Successful in 55s Details Docker Build and Release / release (push) Successful in 14s Details - Updated list styling in DayDetailContent to use a cleaner format without bullet points, improving visual consistency. - Added decorative bullet points for duty, unavailable, vacation, and event summaries to enhance readability. - Adjusted spacing and layout for better alignment of list items, ensuring a more polished user interface.	2026-03-04 10:06:22 +03:00
Nikolay Tatarinov	336e6d48c5	fix: adjust animation duration for SheetContent component - Updated the animation duration for the open state of the SheetContent component from 500ms to 300ms, improving the responsiveness of the UI during state transitions.	2026-03-03 19:47:49 +03:00
Nikolay Tatarinov	07d08bb179	feat: release version 2.0.0 with new features and improvements All checks were successful CI / lint-and-test (push) Successful in 1m3s Details Docker Build and Release / build-and-push (push) Successful in 1m19s Details Docker Build and Release / release (push) Successful in 9s Details - Added group duty pin functionality with configurable notification settings. - Introduced `/refresh_pin` command for immediate duty message updates in groups. - Implemented role-based access management with `/set_role` command for user and admin roles. - Added `/calendar_link` command to provide users with personal ICS subscription URLs. - Configured `MINI_APP_SHORT_NAME` for direct Mini App links in pinned messages. - Introduced `LOG_LEVEL` configuration for backend logging control. - Migrated Mini App to Next.js with enhanced loading states and styling improvements.	2026-03-03 18:55:33 +03:00
Nikolay Tatarinov	378daad503	chore: update CI workflow to include Node.js setup and Next.js build process All checks were successful CI / lint-and-test (push) Successful in 1m5s Details - Added steps to set up Node.js version 20 in the CI workflow. - Included commands to build and test the Next.js web application, ensuring integration with the existing Python-based project.	2026-03-03 18:43:45 +03:00
Nikolay Tatarinov	54f85a8f14	refactor: update DayDetail component and tests for clarity and functionality Some checks failed CI / lint-and-test (push) Failing after 28s Details - Revised unit tests for DayDetailContent to reflect changes in duty entry display, ensuring only time and name are shown without contact links. - Updated styling in DayDetail component to enhance visual consistency with background color adjustments. - Removed unused ContactLinks component from DayDetailContent to streamline the code and improve readability.	2026-03-03 18:29:34 +03:00
Nikolay Tatarinov	8bf92bd4a1	refactor: update DayIndicators component and tests for improved clarity and accuracy - Revised comments in DayIndicators component and test files to better describe the functionality of colored segments and rounding behavior. - Updated test descriptions to reflect changes in rendering logic for single and multiple segments. - Adjusted class names in the component and tests to ensure correct application of rounded styles based on segment positions.	2026-03-03 18:19:52 +03:00
Nikolay Tatarinov	68a153e4a7	feat: implement app content readiness handling in page and components - Added `appContentReady` state to manage visibility of app content once loading is complete. - Updated `useEffect` hooks in `CurrentDutyView` and `CalendarPage` to signal when content is ready, enhancing user experience by hiding native loading indicators. - Refactored `Home` component to conditionally render content based on `appContentReady`, ensuring a smoother transition for users. - Enhanced app store to include `setAppContentReady` method for state management.	2026-03-03 18:11:02 +03:00
Nikolay Tatarinov	cac06f22fa	feat: add controlled flip functionality to DutyTimelineCard component - Introduced `isFlipped` and `onFlipChange` props to `DutyTimelineCard` for controlled flipping behavior. - Updated `DutyList` to manage the flipped state of duty cards, allowing only one card to be flipped at a time. - Enhanced user interaction by implementing dedicated functions for flipping the card to contacts and back, improving usability.	2026-03-03 18:00:36 +03:00
Nikolay Tatarinov	87e8417675	refactor: improve code readability and structure in various components - Refactored the `mini_app_short_name` assignment in `config.py` for better clarity. - Enhanced the `app_config_js` function in `app.py` to improve formatting of the JavaScript response body. - Added per-chat locks in `group_duty_pin.py` to prevent concurrent refreshes, improving message handling. - Updated `_schedule_next_update` to include optional jitter for scheduling, enhancing performance during high-load scenarios. - Cleaned up test files by removing unused imports and improving test descriptions for clarity.	2026-03-03 17:52:23 +03:00
Nikolay Tatarinov	37218a436a	feat: add loopback host configuration for health checks - Introduced LOOPBACK_HTTP_HOSTS in config.py to define valid loopback addresses for health-check URL and MINI_APP_SKIP_AUTH safety. - Updated run.py to utilize LOOPBACK_HTTP_HOSTS for determining the host in health check and authentication logic. - Enhanced test_app.py to skip tests if the required webapp output directory is not built, improving test reliability.	2026-03-03 17:47:39 +03:00
Nikolay Tatarinov	50d734e192	feat: update loading state handling in DutyList component - Replaced the loading skeleton with a compact loading placeholder to improve user experience when data is not yet loaded for the month. - Enhanced the rendering logic to ensure the loading state is visually distinct and does not display the skeleton when data is being fetched. - Updated related tests to verify the new loading behavior and ensure accurate feedback during data fetching.	2026-03-03 17:42:03 +03:00
Nikolay Tatarinov	edf0186682	feat: enhance duty timeline styling for improved visibility - Added horizontal stripe and vertical tick indicators for today's date in the duty timeline, enhancing visual distinction. - Updated current duty card styling to ensure the left stripe matches the "Today" label, improving consistency in the user interface.	2026-03-03 17:36:05 +03:00
Nikolay Tatarinov	6e2188787e	feat: implement pending month handling in calendar components - Introduced a new `pendingMonth` state in the app store to manage month transitions without clearing current data, enhancing user experience during month navigation. - Updated `useMonthData` hook to load data for the `pendingMonth` when set, preventing empty-frame flicker and ensuring smooth month switching. - Modified `CalendarPage` and `CalendarGrid` components to utilize the new `pendingMonth` state, improving the rendering logic during month changes. - Enhanced `DutyList` to display a loading skeleton while data is being fetched, providing better feedback to users. - Updated relevant tests to cover the new loading behavior and state management for month transitions.	2026-03-03 17:20:23 +03:00
Nikolay Tatarinov	fd527917e0	refactor: simplify DutyTimelineCard component by removing TooltipProvider and Tooltip - Removed TooltipProvider and Tooltip components from DutyTimelineCard, streamlining the button interaction for displaying contact information. - Updated the button implementation to directly handle the click event, enhancing code clarity and reducing complexity.	2026-03-03 16:28:07 +03:00
Nikolay Tatarinov	95c9e23c33	refactor: simplify CalendarPage and CalendarHeader components by removing unused props - Removed the handleGoToToday function and its associated prop from CalendarPage, streamlining the component's logic. - Eliminated the isLoading and onRefresh props from CalendarHeader, enhancing clarity and reducing complexity. - Updated internationalization messages to remove references to "Today" and "Refresh," aligning with the component changes.	2026-03-03 16:23:49 +03:00
Nikolay Tatarinov	95f65141e1	fix: update loading state handling in CalendarPage and DutyList components - Set isLoading to false in CalendarPage to prevent unnecessary loading indicators. - Removed the loading spinner from CalendarHeader and adjusted rendering logic in DutyList to show a placeholder when data is not yet loaded for the month. - Enhanced tests in DutyList to verify behavior when data is empty and when data is loading, ensuring accurate user feedback during data fetching.	2026-03-03 16:21:27 +03:00
Nikolay Tatarinov	3b68e29d7b	feat: enhance CalendarPage and DutyList components for improved loading state handling - Removed the loading state placeholder from CalendarPage, directly rendering the CalendarGrid component. - Updated DutyList to display a loading message when data is being fetched, enhancing user experience during data loading. - Introduced a new dataForMonthKey in the app store to manage month-specific data more effectively. - Refactored useMonthData hook to reset duties and calendarEvents when a new month is detected, ensuring accurate data representation. - Added tests to verify the new loading state behavior in both components.	2026-03-03 16:17:24 +03:00
Nikolay Tatarinov	16bf1a1043	feat: migrate to Next.js for Mini App and enhance project structure - Replaced the previous webapp with a new Mini App built using Next.js, improving performance and maintainability. - Updated the `.gitignore` to exclude Next.js build artifacts and node modules. - Revised documentation in `AGENTS.md`, `README.md`, and `architecture.md` to reflect the new Mini App structure and technology stack. - Enhanced Dockerfile to support the new build process for the Next.js application. - Updated CI workflow to build and test the Next.js application. - Added new configuration options for the Mini App, including `MINI_APP_SHORT_NAME` for improved deep linking. - Refactored frontend testing setup to accommodate the new structure and testing framework. - Removed legacy webapp files and dependencies to streamline the project.	2026-03-03 16:04:08 +03:00
Nikolay Tatarinov	2de5c1cb81	fix: update current duty display text for improved clarity Some checks failed CI / lint-and-test (push) Failing after 27s Details - Changed the displayed text for current duty from "Текущее дежурство" to "Сейчас дежурит" to enhance user understanding. - This update aligns with the recent efforts to unify language handling across the application.	2026-03-03 00:12:04 +03:00
Nikolay Tatarinov	70b9050cb7	feat: improve error handling and logging in the web application - Updated the error handling in `index.html` to include a retry button for failed app loads, enhancing user experience. - Added session storage management to prevent repeated reloads on errors. - Enhanced the `.gitignore` file to include log files, improving project cleanliness. - Included error logging in `main.js` to ensure better tracking of issues during app initialization.	2026-03-03 00:10:30 +03:00
Nikolay Tatarinov	7ffa727832	feat: enhance error handling and configuration validation Some checks failed CI / lint-and-test (push) Failing after 27s Details - Added a global exception handler to log unhandled exceptions and return a generic 500 JSON response without exposing details to the client. - Updated the configuration to validate the `DATABASE_URL` format, ensuring it starts with `sqlite://` or `postgresql://`, and log warnings for invalid formats. - Introduced safe parsing for numeric environment variables (`HTTP_PORT`, `INIT_DATA_MAX_AGE_SECONDS`) with defaults on invalid values, including logging warnings for out-of-range values. - Enhanced the duty schedule parser to enforce limits on the number of schedule rows and the length of full names and duty strings, raising appropriate errors when exceeded. - Updated internationalization messages to include generic error responses for import failures and parsing issues, improving user experience. - Added unit tests to verify the new error handling and configuration validation behaviors.	2026-03-02 23:36:03 +03:00
Nikolay Tatarinov	43386b15fa	feat: add configurable logging level for backend and Mini App - Introduced a new `LOG_LEVEL` configuration option in the `.env.example` file to allow users to set the logging level (DEBUG, INFO, WARNING, ERROR). - Updated the `Settings` class to include the `log_level` attribute, normalizing its value to ensure valid logging levels are used. - Modified the logging setup in `run.py` to utilize the configured log level, enhancing flexibility in log management. - Enhanced the Mini App to include the logging level in the JavaScript configuration, allowing for consistent logging behavior across the application. - Added a new `logger.js` module for frontend logging, implementing level-based filtering and console delegation. - Included unit tests for the new logger functionality to ensure proper behavior and level handling.	2026-03-02 23:15:22 +03:00
Nikolay Tatarinov	67ba9826c7	feat: unify language handling across the application - Updated the language configuration to use a single source of truth from `DEFAULT_LANGUAGE` for the bot, API, and Mini App, eliminating auto-detection from user settings. - Refactored the `get_lang` function to always return `DEFAULT_LANGUAGE`, ensuring consistent language usage throughout the application. - Modified the handling of language in various components, including API responses and UI elements, to reflect the new language management approach. - Enhanced documentation and comments to clarify the changes in language handling. - Added unit tests to verify the new language handling behavior and ensure coverage for the updated functionality.	2026-03-02 23:05:28 +03:00
Nikolay Tatarinov	54446d7b0f	feat: enhance UI components and error handling - Updated HTML structure for navigation buttons in the calendar, adding SVG icons for improved visual clarity. - Introduced a new muted text style in CSS for better presentation of empty duty list messages. - Enhanced calendar CSS for navigation buttons and day indicators, improving layout and responsiveness. - Improved error handling in the UI by adding retry functionality to the error display, allowing users to retry actions directly from the error message. - Updated internationalization messages to include a retry option for error handling. - Added unit tests to verify the new error handling behavior and UI updates.	2026-03-02 20:21:33 +03:00
Nikolay Tatarinov	37d4226beb	chore: update project documentation and configuration files - Added AGENTS.md for AI agent documentation and maintainers, outlining project structure and conventions. - Updated CONTRIBUTING.md to specify that all project documentation must be in English, including README and docstrings. - Enhanced README.md to reference documentation guidelines and the new AGENTS.md file. - Cleaned up .gitignore by removing unnecessary entries for cursor-related files. - Introduced new .cursor rules for backend, frontend, project architecture, and testing to standardize development practices.	2026-03-02 20:02:20 +03:00