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.

webapp-next/src/components/current-duty/CurrentDutyView.tsx

@@ -20,7 +20,6 @@ import {
   formatHHMM,
 } from "@/lib/date-utils";
 import { getRemainingTime, findCurrentDuty } from "@/lib/current-duty";
-import { callMiniAppReadyOnce } from "@/lib/telegram-ready";
 import { ContactLinks } from "@/components/contact/ContactLinks";
 import { Button } from "@/components/ui/button";
 import {
@@ -47,6 +46,7 @@ type ViewState = "loading" | "error" | "ready";
 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");
@@ -93,12 +93,12 @@ export function CurrentDutyView({ onBack, openedFromPin = false }: CurrentDutyVi
     return () => controller.abort();
   }, [loadTodayDuties]);
 
-  // Signal Telegram to hide loading when this view is ready (or error).
+  // Mark content ready when data is loaded or error, so page can call ready() and show content.
   useEffect(() => {
     if (state !== "loading") {
-      callMiniAppReadyOnce();
+      setAppContentReady(true);
     }
-  }, [state]);
+  }, [state, setAppContentReady]);
 
   // Auto-update remaining time every second when there is an active duty.
   useEffect(() => {