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.

webapp-next/src/components/duty/DutyList.test.tsx

@@ -0,0 +1,66 @@
+/**
+ * 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", () => {
+    useAppStore.getState().setDuties([]);
+    render(<DutyList />);
+    expect(screen.getByText(/No duties this month/i)).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));
+    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));
+    render(<DutyList />);
+    expect(screen.getAllByText("Alice").length).toBeGreaterThanOrEqual(1);
+    expect(document.querySelector('a[href^="tel:"]')).toBeInTheDocument();
+    expect(document.querySelector('a[href*="t.me"]')).toBeInTheDocument();
+  });
+});