feat: enhance admin page and testing functionality

- Updated admin page to include navigation buttons for month selection, improving user experience.
- Refactored `AdminDutyList` to group duties by date, enhancing the display and organization of duties.
- Improved error handling in `ReassignSheet` by using i18n keys for error messages, ensuring better localization support.
- Enhanced tests for admin page and components to reflect recent changes, ensuring accuracy in functionality and accessibility.
- Added event dispatch for configuration loading in the app configuration, improving integration with the Telegram Mini App.

duty_teller/api/app.py

@@ -169,7 +169,8 @@ def app_config_js() -> Response:
     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}'
+        f'window.__DT_LANG = "{lang}";\nwindow.__DT_LOG_LEVEL = "{log_level}";{tz_js}\n'
+        'if (typeof window !== "undefined") window.dispatchEvent(new Event("dt-config-loaded"));'
     )
     return Response(
         content=body,

webapp-next/src/app/admin/page.test.tsx

@@ -55,7 +55,7 @@ function mockFetchForAdmin(
   const adminMe = options?.adminMe ?? { is_admin: true };
   vi.stubGlobal(
     "fetch",
-    vi.fn((url: string, init?: RequestInit) => {
+    vi.fn((url: string, _init?: RequestInit) => {
       if (url.includes("/api/admin/me")) {
         return Promise.resolve({
           ok: true,
@@ -163,7 +163,7 @@ describe("AdminPage", () => {
     fireEvent.click(dutyButton);
     await waitFor(() => {
       expect(
-        screen.getByLabelText(/select user|выберите пользователя/i)
+        screen.getByRole("radiogroup", { name: /select user|выберите пользователя/i })
       ).toBeInTheDocument();
     });
     expect(screen.getByRole("button", { name: /save|сохранить/i })).toBeInTheDocument();
@@ -231,10 +231,9 @@ describe("AdminPage", () => {
     });
     fireEvent.click(screen.getByRole("button", { name: /Alice/ }));
     await waitFor(() => {
-      expect(screen.getByLabelText(/select user|выберите пользователя/i)).toBeInTheDocument();
+      expect(screen.getByRole("radiogroup", { name: /select user|выберите пользователя/i })).toBeInTheDocument();
     });
-    const select = screen.getByLabelText(/select user|выберите пользователя/i);
+    fireEvent.click(screen.getByRole("radio", { name: /Bob/ }));
-    fireEvent.change(select, { target: { value: "2" } });
     fireEvent.click(screen.getByRole("button", { name: /save|сохранить/i }));
     await waitFor(() => {
       expect(

webapp-next/src/app/admin/page.tsx

@@ -11,6 +11,8 @@ import { useTranslation } from "@/i18n/use-translation";
 import { AccessDeniedScreen } from "@/components/states/AccessDeniedScreen";
 import { LoadingState } from "@/components/states/LoadingState";
 import { ErrorState } from "@/components/states/ErrorState";
+import { Button } from "@/components/ui/button";
+import { ChevronLeft as ChevronLeftIcon, ChevronRight as ChevronRightIcon } from "lucide-react";
 
 const PAGE_WRAPPER_CLASS =
   "content-safe mx-auto flex min-h-[var(--tg-viewport-stable-height,100vh)] w-full max-w-[var(--max-width-app)] flex-col bg-background px-3 pb-6";
@@ -50,27 +52,54 @@ export default function AdminPage() {
     );
   }
 
-  const month = admin.currentMonth.getMonth();
+  const month = admin.adminMonth.getMonth();
-  const year = admin.currentMonth.getFullYear();
+  const year = admin.adminMonth.getFullYear();
 
   return (
     <div className={PAGE_WRAPPER_CLASS}>
       <header className="sticky top-0 z-10 flex flex-col items-center border-b bg-[var(--header-bg)] py-3">
-        <h1
+        <div className="flex w-full items-center justify-between px-1">
-          className="m-0 flex flex-col items-center justify-center gap-0 leading-none"
+          <Button
-          aria-label={`${t("admin.title")}, ${monthName(month)} ${year}`}
+            type="button"
-        >
+            variant="secondary"
-          <span className="text-xs font-normal leading-none text-muted">
+            size="icon"
-            {year}
+            className="size-10 rounded-[10px] bg-surface text-accent hover:bg-[var(--surface-hover)] focus-visible:outline-accent active:scale-95 disabled:opacity-50"
-          </span>
+            aria-label={t("nav.prev_month")}
-          <span className="text-[1.1rem] font-semibold leading-tight sm:text-[1.25rem]">
+            disabled={admin.loading}
-            {monthName(month)}
+            onClick={admin.onPrevMonth}
-          </span>
+          >
-        </h1>
+            <ChevronLeftIcon className="size-5" aria-hidden />
+          </Button>
+          <h1
+            className="m-0 flex flex-col items-center justify-center gap-0 leading-none"
+            aria-label={`${t("admin.title")}, ${monthName(month)} ${year}`}
+          >
+            <span className="text-xs font-normal leading-none text-muted">
+              {year}
+            </span>
+            <span className="text-[1.1rem] font-semibold leading-tight sm:text-[1.25rem]">
+              {monthName(month)}
+            </span>
+          </h1>
+          <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={admin.loading}
+            onClick={admin.onNextMonth}
+          >
+            <ChevronRightIcon className="size-5" aria-hidden />
+          </Button>
+        </div>
+        <p className="text-sm text-muted-foreground m-0 mt-1">
+          {admin.loading ? "…" : t("admin.duties_count", { count: String(admin.dutyOnly.length) })}
+        </p>
       </header>
 
       {admin.successMessage && (
-        <p className="mt-3 text-sm text-[var(--duty)]" role="status">
+        <p className="mt-3 text-sm text-[var(--duty)]" role="status" aria-live="polite">
           {admin.successMessage}
         </p>
       )}
@@ -96,7 +125,7 @@ export default function AdminPage() {
             {t("admin.reassign_duty")}: {t("admin.select_user")}
           </p>
           <AdminDutyList
-            duties={admin.visibleDuties}
+            groups={admin.visibleGroups}
             hasMore={admin.hasMore}
             sentinelRef={admin.sentinelRef}
             onSelectDuty={admin.openReassign}
@@ -112,7 +141,7 @@ export default function AdminPage() {
         setSelectedUserId={admin.setSelectedUserId}
         users={admin.usersForSelect}
         saving={admin.saving}
-        reassignError={admin.reassignError}
+        reassignErrorKey={admin.reassignErrorKey}
         onReassign={admin.handleReassign}
         onRequestClose={admin.requestCloseSheet}
         onCloseAnimationEnd={admin.closeReassign}

webapp-next/src/app/page.test.tsx

@@ -50,12 +50,11 @@ describe("Page", () => {
   });
 
   it("sets document title for ru when store lang is ru", async () => {
-    (globalThis.window as unknown as { __DT_LANG?: string }).__DT_LANG = "ru";
+    useAppStore.getState().setLang("ru");
     render(<Page />);
     await screen.findByRole("grid", { name: "Calendar" });
-    await waitFor(() => {
+    expect(document.title).toBe("Календарь дежурств");
-      expect(document.title).toBe("Календарь дежурств");
+    expect(document.documentElement.lang).toBe("ru");
-    });
   });
 
   it("renders AccessDeniedScreen when not allowed and delay has passed", async () => {

webapp-next/src/components/admin/AdminDutyList.tsx

@@ -4,16 +4,51 @@
 
 "use client";
 
+import { useRouter } from "next/navigation";
 import type { DutyWithUser } from "@/types";
-import { localDateString, formatHHMM } from "@/lib/date-utils";
+import { localDateString, formatHHMM, dateKeyToDDMM } from "@/lib/date-utils";
+import { Button } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+
+export interface AdminDutyGroup {
+  dateKey: string;
+  duties: DutyWithUser[];
+}
+
+/** Empty state when there are no duties: message and "Back to calendar" CTA. */
+function AdminEmptyState({
+  t,
+}: {
+  t: (key: string, params?: Record<string, string>) => string;
+}) {
+  const router = useRouter();
+  return (
+    <div className="flex flex-col items-center gap-4 py-8 text-center">
+      <h2 className="text-[1.1rem] font-semibold leading-tight m-0">
+        {t("admin.no_duties")}
+      </h2>
+      <p className="text-sm text-muted-foreground m-0 max-w-[280px]">
+        {t("duty.none_this_month_hint")}
+      </p>
+      <Button
+        type="button"
+        variant="secondary"
+        onClick={() => router.push("/")}
+        className="bg-surface text-accent hover:bg-[var(--surface-hover)]"
+      >
+        {t("admin.back_to_calendar")}
+      </Button>
+    </div>
+  );
+}
 
 export interface AdminDutyListProps {
-  /** Duties to show (already sliced to visibleCount by parent). */
+  /** Duty groups by date (already sliced to visibleCount by parent). */
-  duties: DutyWithUser[];
+  groups: AdminDutyGroup[];
   /** Whether there are more items; when true, sentinel is rendered for intersection observer. */
   hasMore: boolean;
   /** Ref for the sentinel element (infinite scroll). */
-  sentinelRef: React.RefObject<HTMLLIElement | null>;
+  sentinelRef: React.RefObject<HTMLDivElement | null>;
   /** Called when user selects a duty to reassign. */
   onSelectDuty: (duty: DutyWithUser) => void;
   /** Translation function. */
@@ -21,46 +56,73 @@ export interface AdminDutyListProps {
 }
 
 export function AdminDutyList({
-  duties,
+  groups,
   hasMore,
   sentinelRef,
   onSelectDuty,
   t,
 }: AdminDutyListProps) {
-  if (duties.length === 0) {
+  if (groups.length === 0) {
-    return <p className="text-muted-foreground py-4">{t("admin.no_duties")}</p>;
+    return <AdminEmptyState t={t} />;
   }
 
+  const todayKey = localDateString(new Date());
   return (
-    <ul className="flex flex-col gap-1.5" aria-label={t("admin.list_aria")}>
+    <div className="flex flex-col gap-3" role="list" aria-label={t("admin.list_aria")}>
-      {duties.map((duty) => {
+      {groups.map(({ dateKey, duties }) => {
-        const dateStr = localDateString(new Date(duty.start_at));
+        const isToday = dateKey === todayKey;
-        const timeStr = `${formatHHMM(duty.start_at)} – ${formatHHMM(duty.end_at)}`;
+        const dateLabel = isToday ? t("duty.today") : dateKeyToDDMM(dateKey);
         return (
-          <li key={duty.id}>
+          <section
-            <button
+            key={dateKey}
-              type="button"
+            className="flex flex-col gap-1.5"
-              onClick={() => onSelectDuty(duty)}
+            aria-label={t("admin.section_aria", { date: dateLabel })}
-              aria-label={t("admin.reassign_aria", {
+          >
-                date: dateStr,
+            <p
-                time: timeStr,
+              className={cn(
-                name: duty.full_name,
+                "text-[0.75rem] font-medium text-muted m-0 pl-0.5",
-              })}
+                isToday && "border-l-[3px] border-l-today pl-2 text-[var(--section-header)]"
-              className="w-full rounded-lg border border-l-[3px] border-l-duty bg-surface px-3 py-2.5 text-left text-sm transition-colors hover:bg-[var(--surface-hover)] focus-visible:outline-accent flex flex-col gap-0.5"
+              )}
             >
-              <span>
+              {dateLabel}
-                <span className="font-medium">{dateStr}</span>
+            </p>
-                <span className="mx-2 text-muted-foreground">·</span>
+            <ul className="flex flex-col gap-1.5 list-none m-0 p-0">
-                <span className="text-muted-foreground">{timeStr}</span>
+              {duties.map((duty) => {
-              </span>
+                const dateStr = localDateString(new Date(duty.start_at));
-              <span>{duty.full_name}</span>
+                const timeStr = `${formatHHMM(duty.start_at)} – ${formatHHMM(duty.end_at)}`;
-            </button>
+                return (
-          </li>
+                  <li key={duty.id}>
+                    <button
+                      type="button"
+                      onClick={() => onSelectDuty(duty)}
+                      aria-label={t("admin.reassign_aria", {
+                        date: dateStr,
+                        time: timeStr,
+                        name: duty.full_name,
+                      })}
+                      className={cn(
+                        "w-full min-h-0 rounded-lg border border-l-[3px] bg-surface px-2.5 py-2 shadow-sm text-left text-sm transition-colors",
+                        "hover:bg-[var(--surface-hover)] focus-visible:outline-accent flex flex-col gap-0.5",
+                        isToday ? "border-l-today" : "border-l-duty"
+                      )}
+                    >
+                      <span>
+                        <span className="font-medium">{dateStr}</span>
+                        <span className="mx-2 text-muted-foreground">·</span>
+                        <span className="text-muted-foreground">{timeStr}</span>
+                      </span>
+                      <span>{duty.full_name}</span>
+                    </button>
+                  </li>
+                );
+              })}
+            </ul>
+          </section>
         );
       })}
       {hasMore && (
-        <li ref={sentinelRef} className="h-2" data-sentinel aria-hidden="true" />
+        <div ref={sentinelRef} className="h-2" data-sentinel aria-hidden="true" />
       )}
-    </ul>
+    </div>
   );
 }

webapp-next/src/components/admin/ReassignSheet.tsx

@@ -16,6 +16,7 @@ import {
   SheetDescription,
   SheetFooter,
 } from "@/components/ui/sheet";
+import { cn } from "@/lib/utils";
 
 export interface ReassignSheetProps {
   /** Whether the sheet is open (and not in exiting state). */
@@ -30,8 +31,8 @@ export interface ReassignSheetProps {
   users: UserForAdmin[];
   /** Reassign request in progress. */
   saving: boolean;
-  /** Error message from last reassign attempt. */
+  /** i18n key for error message from last reassign attempt; null when no error. */
-  reassignError: string | null;
+  reassignErrorKey: string | null;
   /** Called when user confirms reassign. */
   onReassign: () => void;
   /** Called when user requests close (start close animation). */
@@ -49,7 +50,7 @@ export function ReassignSheet({
   setSelectedUserId,
   users,
   saving,
-  reassignError,
+  reassignErrorKey,
   onReassign,
   onRequestClose,
   onCloseAnimationEnd,
@@ -59,13 +60,13 @@ export function ReassignSheet({
     <Sheet open={open} onOpenChange={(isOpen) => !isOpen && onRequestClose()}>
       <SheetContent
         side="bottom"
-        className="rounded-t-2xl pt-3 max-h-[70vh] bg-[var(--surface)] pb-[calc(24px+env(safe-area-inset-bottom,0px))]"
+        className="flex max-h-[85vh] flex-col rounded-t-2xl bg-[var(--surface)] p-0 pt-3"
         overlayClassName="backdrop-blur-md"
         showCloseButton={false}
         onCloseAnimationEnd={onCloseAnimationEnd}
         onOpenAutoFocus={(e) => e.preventDefault()}
       >
-        <div className="relative px-4">
+        <div className="relative min-h-0 flex-1 overflow-y-auto px-4">
           <Button
             type="button"
             variant="ghost"
@@ -104,42 +105,62 @@ export function ReassignSheet({
                 {localDateString(new Date(selectedDuty.start_at))}{" "}
                 {formatHHMM(selectedDuty.start_at)} – {formatHHMM(selectedDuty.end_at)}
               </p>
+              <p className="text-xs text-muted-foreground">
+                {t("admin.current_assignee")}: {selectedDuty.full_name}
+              </p>
               {users.length === 0 ? (
                 <p className="text-sm text-muted-foreground">
                   {t("admin.no_users_for_assign")}
                 </p>
               ) : (
-                <div className="flex flex-col gap-2">
+                <div
-                  <label htmlFor="admin-user-select" className="text-sm font-medium">
+                  className="flex flex-col gap-1 max-h-[40vh] overflow-y-auto rounded-lg border border-border py-1"
-                    {t("admin.select_user")}
+                  role="radiogroup"
-                  </label>
+                  aria-label={t("admin.select_user")}
-                  <select
+                >
-                    id="admin-user-select"
+                  {users.map((u) => {
-                    value={selectedUserId === "" ? "" : String(selectedUserId)}
+                    const isCurrent = u.id === selectedDuty.user_id;
-                    onChange={(e) =>
+                    const isSelected = selectedUserId === u.id;
-                      setSelectedUserId(e.target.value === "" ? "" : Number(e.target.value))
+                    return (
-                    }
+                      <button
-                    className="rounded-md border bg-background px-3 py-2 text-sm focus-visible:outline-accent"
+                        key={u.id}
-                    disabled={saving}
+                        type="button"
-                  >
+                        role="radio"
-                    {users.map((u) => (
+                        aria-checked={isSelected}
-                      <option key={u.id} value={u.id}>
+                        disabled={saving}
-                        {u.full_name}
+                        onClick={() => setSelectedUserId(u.id)}
-                        {u.username ? ` (@${u.username})` : ""}
+                        className={cn(
-                      </option>
+                          "flex flex-col items-start gap-0.5 rounded-md px-3 py-2.5 text-left text-sm transition-colors",
-                    ))}
+                          "hover:bg-[var(--surface-hover)] focus-visible:outline-accent focus-visible:ring-2 focus-visible:ring-accent",
-                  </select>
+                          isCurrent && "bg-[var(--surface-today-tint)]",
+                          isSelected && "ring-2 ring-accent ring-inset"
+                        )}
+                      >
+                        <span className="font-medium">
+                          {u.full_name}
+                          {isCurrent && (
+                            <span className="ml-2 text-xs text-muted-foreground font-normal">
+                              ({t("admin.current_assignee")})
+                            </span>
+                          )}
+                        </span>
+                        {u.username && (
+                          <span className="text-xs text-muted-foreground">@{u.username}</span>
+                        )}
+                      </button>
+                    );
+                  })}
                 </div>
               )}
-              {reassignError && (
+              {reassignErrorKey && (
-                <p className="text-sm text-destructive" role="alert">
+                <p id="admin-reassign-error" className="text-sm text-destructive" role="alert">
-                  {reassignError}
+                  {t(reassignErrorKey)}
                 </p>
               )}
             </div>
           )}
         </div>
-        <SheetFooter className="flex-row justify-end gap-2">
+        <SheetFooter className="flex-shrink-0 flex-row justify-end gap-2 border-t border-border bg-[var(--surface)] px-4 py-3 pb-[calc(12px+env(safe-area-inset-bottom,0px))]">
           <Button
             onClick={onReassign}
             disabled={
@@ -148,6 +169,7 @@ export function ReassignSheet({
               selectedUserId === selectedDuty?.user_id ||
               users.length === 0
             }
+            aria-describedby={reassignErrorKey ? "admin-reassign-error" : undefined}
           >
             {saving ? t("loading") : t("admin.save")}
           </Button>

webapp-next/src/components/admin/index.ts

@@ -5,5 +5,5 @@
 export { useAdminPage } from "./useAdminPage";
 export { AdminDutyList } from "./AdminDutyList";
 export { ReassignSheet } from "./ReassignSheet";
-export type { AdminDutyListProps } from "./AdminDutyList";
+export type { AdminDutyListProps, AdminDutyGroup } from "./AdminDutyList";
 export type { ReassignSheetProps } from "./ReassignSheet";

webapp-next/src/components/admin/useAdminPage.ts

@@ -8,6 +8,7 @@
 import { useEffect, useState, useCallback, useRef } from "react";
 import { useRouter } from "next/navigation";
 import { backButton } from "@telegram-apps/sdk-react";
+import { useTelegramSdkReady } from "@/components/providers/TelegramProvider";
 import { useAppStore } from "@/store/app-store";
 import { useShallow } from "zustand/react/shallow";
 import { useTelegramAuth } from "@/hooks/use-telegram-auth";
@@ -20,6 +21,7 @@ import {
   AccessDeniedError,
   type UserForAdmin,
 } from "@/lib/api";
+import { triggerHapticLight } from "@/lib/telegram-haptic";
 import type { DutyWithUser } from "@/types";
 import {
   firstDayOfMonth,
@@ -31,6 +33,7 @@ const PAGE_SIZE = 20;
 
 export function useAdminPage() {
   const router = useRouter();
+  const { sdkReady } = useTelegramSdkReady();
   const { initDataRaw, isLocalhost } = useTelegramAuth();
   const isAllowed = isLocalhost || !!initDataRaw;
 
@@ -38,6 +41,9 @@ export function useAdminPage() {
   const currentMonth = useAppStore((s) => s.currentMonth);
   const { t } = useTranslation();
 
+  /** Local month for admin view; does not change global calendar month. */
+  const [adminMonth, setAdminMonth] = useState<Date>(() => new Date(currentMonth.getFullYear(), currentMonth.getMonth(), 1));
+
   const [users, setUsers] = useState<UserForAdmin[]>([]);
   const [duties, setDuties] = useState<DutyWithUser[]>([]);
   const [loadingUsers, setLoadingUsers] = useState(true);
@@ -49,17 +55,26 @@ export function useAdminPage() {
   const [selectedDuty, setSelectedDuty] = useState<DutyWithUser | null>(null);
   const [selectedUserId, setSelectedUserId] = useState<number | "">("");
   const [saving, setSaving] = useState(false);
-  const [reassignError, setReassignError] = useState<string | null>(null);
+  const [reassignErrorKey, setReassignErrorKey] = useState<string | null>(null);
   const [successMessage, setSuccessMessage] = useState<string | null>(null);
   const [visibleCount, setVisibleCount] = useState(PAGE_SIZE);
   const [sheetExiting, setSheetExiting] = useState(false);
-  const sentinelRef = useRef<HTMLLIElement | null>(null);
+  const sentinelRef = useRef<HTMLDivElement | null>(null);
+  const navigateHomeRef = useRef(() => router.push("/"));
+  navigateHomeRef.current = () => router.push("/");
 
-  const from = localDateString(firstDayOfMonth(currentMonth));
+  const from = localDateString(firstDayOfMonth(adminMonth));
-  const to = localDateString(lastDayOfMonth(currentMonth));
+  const to = localDateString(lastDayOfMonth(adminMonth));
+
+  const onPrevMonth = useCallback(() => {
+    setAdminMonth((prev) => new Date(prev.getFullYear(), prev.getMonth() - 1, 1));
+  }, []);
+  const onNextMonth = useCallback(() => {
+    setAdminMonth((prev) => new Date(prev.getFullYear(), prev.getMonth() + 1, 1));
+  }, []);
 
   useEffect(() => {
-    if (isLocalhost) return;
+    if (!sdkReady || isLocalhost) return;
     let offClick: (() => void) | undefined;
     try {
       if (backButton.mount.isAvailable()) {
@@ -69,7 +84,7 @@ export function useAdminPage() {
         backButton.show();
       }
       if (backButton.onClick.isAvailable()) {
-        offClick = backButton.onClick(() => router.push("/"));
+        offClick = backButton.onClick(() => navigateHomeRef.current());
       }
     } catch {
       // Non-Telegram environment; BackButton not available.
@@ -84,7 +99,7 @@ export function useAdminPage() {
         // Ignore cleanup errors in non-Telegram environment.
       }
     };
-  }, [isLocalhost, router]);
+  }, [sdkReady, isLocalhost, router]);
 
   useEffect(() => {
     if (!isAllowed || !initDataRaw) return;
@@ -148,7 +163,7 @@ export function useAdminPage() {
   const closeReassign = useCallback(() => {
     setSelectedDuty(null);
     setSelectedUserId("");
-    setReassignError(null);
+    setReassignErrorKey(null);
     setSheetExiting(false);
   }, []);
 
@@ -163,7 +178,7 @@ export function useAdminPage() {
   const openReassign = useCallback((duty: DutyWithUser) => {
     setSelectedDuty(duty);
     setSelectedUserId(duty.user_id);
-    setReassignError(null);
+    setReassignErrorKey(null);
   }, []);
 
   const requestCloseSheet = useCallback(() => {
@@ -177,7 +192,7 @@ export function useAdminPage() {
       return;
     }
     setSaving(true);
-    setReassignError(null);
+    setReassignErrorKey(null);
     patchAdminDuty(selectedDuty.id, selectedUserId, initDataRaw, lang)
       .then((updated) => {
         setDuties((prev) =>
@@ -193,11 +208,27 @@ export function useAdminPage() {
           )
         );
         setSuccessMessage(t("admin.reassign_success"));
+        try {
+          triggerHapticLight();
+        } catch {
+          // Haptic not available (e.g. non-Telegram).
+        }
         requestCloseSheet();
         setTimeout(() => setSuccessMessage(null), 3000);
       })
       .catch((e) => {
-        setReassignError(e instanceof Error ? e.message : String(e));
+        if (e instanceof AccessDeniedError) {
+          setReassignErrorKey("admin.reassign_error_denied");
+        } else if (e instanceof Error && /not found|не найден/i.test(e.message)) {
+          setReassignErrorKey("admin.reassign_error_not_found");
+        } else if (
+          e instanceof TypeError ||
+          (e instanceof Error && (e.message === "Failed to fetch" || e.message === "Load failed"))
+        ) {
+          setReassignErrorKey("admin.reassign_error_network");
+        } else {
+          setReassignErrorKey("admin.reassign_error_generic");
+        }
       })
       .finally(() => setSaving(false));
   }, [selectedDuty, selectedUserId, initDataRaw, lang, users, closeReassign, requestCloseSheet, t]);
@@ -215,6 +246,17 @@ export function useAdminPage() {
   const hasMore = visibleCount < dutyOnly.length;
   const loading = loadingUsers || loadingDuties;
 
+  /** Group visible duties by date (dateKey) for sectioned list. Order preserved by insertion. */
+  const visibleGroups = (() => {
+    const map = new Map<string, DutyWithUser[]>();
+    for (const d of visibleDuties) {
+      const key = localDateString(new Date(d.start_at));
+      if (!map.has(key)) map.set(key, []);
+      map.get(key)!.push(d);
+    }
+    return Array.from(map.entries()).map(([dateKey, duties]) => ({ dateKey, duties }));
+  })();
+
   useEffect(() => {
     if (!hasMore || !sentinelRef.current) return;
     const el = sentinelRef.current;
@@ -237,18 +279,21 @@ export function useAdminPage() {
     adminAccessDeniedDetail,
     error,
     loading,
-    currentMonth,
+    adminMonth,
+    onPrevMonth,
+    onNextMonth,
     successMessage,
     dutyOnly,
     usersForSelect,
     visibleDuties,
+    visibleGroups,
     hasMore,
     sentinelRef,
     selectedDuty,
     selectedUserId,
     setSelectedUserId,
     saving,
-    reassignError,
+    reassignErrorKey,
     sheetExiting,
     openReassign,
     requestCloseSheet,

webapp-next/src/components/providers/TelegramProvider.tsx

@@ -1,6 +1,6 @@
 "use client";
 
-import { useEffect } from "react";
+import { createContext, useContext, useEffect, useState } from "react";
 import {
   init,
   mountMiniAppSync,
@@ -12,6 +12,24 @@ import {
 } from "@telegram-apps/sdk-react";
 import { fixSurfaceContrast } from "@/hooks/use-telegram-theme";
 import { applyAndroidPerformanceClass } from "@/lib/telegram-android-perf";
+import { useAppStore } from "@/store/app-store";
+import { getLang } from "@/i18n/messages";
+import { useTranslation } from "@/i18n/use-translation";
+
+const EVENT_CONFIG_LOADED = "dt-config-loaded";
+
+export interface TelegramSdkContextValue {
+  /** True after init() and sync mounts have run; safe to use backButton etc. */
+  sdkReady: boolean;
+}
+
+const TelegramSdkContext = createContext<TelegramSdkContextValue>({
+  sdkReady: false,
+});
+
+export function useTelegramSdkReady(): TelegramSdkContextValue {
+  return useContext(TelegramSdkContext);
+}
 
 /**
  * Wraps the app with Telegram Mini App SDK initialization.
@@ -22,12 +40,34 @@ import { applyAndroidPerformanceClass } from "@/lib/telegram-android-perf";
  * lib/telegram-ready when the first visible screen has finished loading.
  * Theme is set before first paint by the inline script in layout.tsx (URL hash);
  * useTelegramTheme() in the app handles ongoing theme changes.
+ * Syncs lang from window.__DT_LANG on mount and when config.js fires dt-config-loaded.
  */
 export function TelegramProvider({
   children,
 }: {
   children: React.ReactNode;
 }) {
+  const [sdkReady, setSdkReady] = useState(false);
+  const setLang = useAppStore((s) => s.setLang);
+  const lang = useAppStore((s) => s.lang);
+  const { t } = useTranslation();
+
+  // Sync lang from backend config: on mount and when config.js has loaded (all routes, including admin).
+  useEffect(() => {
+    if (typeof window === "undefined") return;
+    setLang(getLang());
+    const onConfigLoaded = () => setLang(getLang());
+    window.addEventListener(EVENT_CONFIG_LOADED, onConfigLoaded);
+    return () => window.removeEventListener(EVENT_CONFIG_LOADED, onConfigLoaded);
+  }, [setLang]);
+
+  // Apply lang to document (title and html lang) so all routes including admin get correct title.
+  useEffect(() => {
+    if (typeof document === "undefined") return;
+    document.documentElement.lang = lang;
+    document.title = t("app.title");
+  }, [lang, t]);
+
   useEffect(() => {
     const cleanup = init({ acceptCustomStyles: true });
 
@@ -46,6 +86,8 @@ export function TelegramProvider({
 
     applyAndroidPerformanceClass();
 
+    setSdkReady(true);
+
     let unbindViewportCssVars: (() => void) | undefined;
     if (mountViewport.isAvailable()) {
       mountViewport()
@@ -60,11 +102,16 @@ export function TelegramProvider({
     }
 
     return () => {
+      setSdkReady(false);
       unbindViewportCssVars?.();
       unmountViewport();
       cleanup();
     };
   }, []);
 
-  return <>{children}</>;
+  return (
+    <TelegramSdkContext.Provider value={{ sdkReady }}>
+      {children}
+    </TelegramSdkContext.Provider>
+  );
 }

webapp-next/src/hooks/use-app-init.ts

@@ -7,7 +7,6 @@
 
 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";
 
@@ -19,24 +18,18 @@ export interface UseAppInitParams {
 }
 
 /**
- * Syncs language from backend config, applies document lang/title, handles access denied
+ * Applies document lang/title from store (when this hook runs, e.g. main page).
- * when not allowed, and routes to current duty view when opened via startParam=duty.
+ * Handles access denied when not allowed and routes to current duty view when opened via startParam=duty.
+ * Language is synced from window.__DT_LANG in TelegramProvider (all routes).
  */
 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).
+  // Apply lang to document (title and html lang) when main page is mounted (tests render Page without TelegramProvider).
-  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;

webapp-next/src/i18n/messages.ts

@@ -86,6 +86,7 @@ export const MESSAGES: Record<Lang, Record<string, string>> = {
     "admin.title": "Admin",
     "admin.reassign_duty": "Reassign duty",
     "admin.select_user": "Select user",
+    "admin.current_assignee": "Current",
     "admin.reassign_success": "Duty reassigned",
     "admin.access_denied": "Access only for administrators.",
     "admin.duty_not_found": "Duty not found",
@@ -95,8 +96,14 @@ export const MESSAGES: Record<Lang, Record<string, string>> = {
     "admin.no_duties": "No duties this month.",
     "admin.no_users_for_assign": "No users available for assignment.",
     "admin.save": "Save",
+    "admin.duties_count": "{count} duties this month",
     "admin.list_aria": "List of duties to reassign",
     "admin.reassign_aria": "Reassign duty: {date}, {time}, {name}",
+    "admin.section_aria": "Duties for {date}",
+    "admin.reassign_error_generic": "Could not reassign duty. Try again.",
+    "admin.reassign_error_denied": "Access denied.",
+    "admin.reassign_error_not_found": "Duty or user not found.",
+    "admin.reassign_error_network": "Network error. Check your connection.",
   },
   ru: {
     "app.title": "Календарь дежурств",
@@ -178,6 +185,7 @@ export const MESSAGES: Record<Lang, Record<string, string>> = {
     "admin.title": "Админка",
     "admin.reassign_duty": "Переназначить дежурного",
     "admin.select_user": "Выберите пользователя",
+    "admin.current_assignee": "Текущий",
     "admin.reassign_success": "Дежурство переназначено",
     "admin.access_denied": "Доступ только для администраторов.",
     "admin.duty_not_found": "Дежурство не найдено",
@@ -187,8 +195,14 @@ export const MESSAGES: Record<Lang, Record<string, string>> = {
     "admin.no_duties": "В этом месяце дежурств нет.",
     "admin.no_users_for_assign": "Нет пользователей для назначения.",
     "admin.save": "Сохранить",
+    "admin.duties_count": "{count} дежурств в этом месяце",
     "admin.list_aria": "Список дежурств для перераспределения",
     "admin.reassign_aria": "Переназначить дежурство: {date}, {time}, {name}",
+    "admin.section_aria": "Дежурства за {date}",
+    "admin.reassign_error_generic": "Не удалось переназначить дежурство. Попробуйте снова.",
+    "admin.reassign_error_denied": "Доступ запрещён.",
+    "admin.reassign_error_not_found": "Дежурство или пользователь не найдены.",
+    "admin.reassign_error_network": "Ошибка сети. Проверьте подключение.",
   },
 };