Remove onAppOpened and related LiveActivity state

Remove the _lastActivityRecreation field and the onAppOpened(...) method from LiveActivityService, which previously handled ending/creating activities, refreshing push tokens, fetching the week's timetable and scheduling background fetch. Update home_screen to call LiveActivityService.checkAndUpdateTimetable(...) instead of onAppOpened, and tweak related log messages to clarify the behavior. This simplifies LiveActivity lifecycle on app resume and stops forced activity recreation/token refresh performed by the removed method.

firka/lib/helpers/live_activity_service.dart

@@ -30,7 +30,6 @@ class LiveActivityService {
   static Timer? _updateTimer;
   static String? _cachedDeviceToken;
   static bool _isInitialized = false;
-  static DateTime? _lastActivityRecreation;
 
   static Timer? _bellDelayDebounceTimer;
   static double? _pendingBellDelay;
@@ -951,7 +950,6 @@ class LiveActivityService {
 
         if (liveActivityEnabled) {
           await _startPlaceholderActivity(allLessons, studentName);
-          _lastActivityRecreation = DateTime.now();
         }
 
         await _startTimetableMonitoring(
@@ -971,67 +969,6 @@ class LiveActivityService {
     }
   }
 
-  /// Called when app is opened - sends timetable to backend, backend handles updates
-  static Future<void> onAppOpened({
-    required KretaClient client,
-    required String studentName,
-    SettingsStore? settingsStore,
-  }) async {
-    if (!Platform.isIOS || !_isInitialized) return;
-
-    try {
-      final enabled = await isEnabled(settingsStore, client);
-      if (!enabled) {
-        _logger.info('LiveActivity is disabled, ending any running activities');
-        await LiveActivityManager.endAllActivities();
-        return;
-      }
-
-      final now = DateTime.now();
-      if (_lastActivityRecreation != null) {
-        final timeSinceLastRecreation = now.difference(_lastActivityRecreation!);
-        if (timeSinceLastRecreation < const Duration(minutes: 5)) {
-          _logger.info('onAppOpened: Skipping activity recreation, last was ${timeSinceLastRecreation.inSeconds}s ago');
-          await checkAndUpdateTimetable(
-              client: client,
-              studentName: studentName,
-              settingsStore: settingsStore
-          );
-          return;
-        }
-      }
-
-      final activeActivities = await LiveActivityManager.getActiveActivities();
-      if (activeActivities.isNotEmpty) {
-        _logger.info('Ending existing activity to refresh push token (8-hour expiration)');
-        await LiveActivityManager.endAllActivities();
-        await Future.delayed(const Duration(milliseconds: 500));
-      }
-
-      final todayStart = DateTime(now.year, now.month, now.day);
-      final startOfWeek = todayStart.subtract(Duration(days: now.weekday - 1));
-      final endOfWeek = startOfWeek.add(const Duration(days: 6));
-      final timetableResponse = await client.getTimeTable(startOfWeek, endOfWeek);
-      final allLessons = timetableResponse.response ?? [];
-
-      await _startPlaceholderActivity(allLessons, studentName);
-      _lastActivityRecreation = now;
-
-      _logger.info('New activity created with fresh push token');
-
-      await checkAndUpdateTimetable(
-          client: client,
-          studentName: studentName,
-          settingsStore: settingsStore
-      );
-
-      await scheduleBackgroundFetch();
-
-    } catch (e) {
-      _logger.severe('Error handling onAppOpened for LiveActivity: $e');
-    }
-  }
-
   /// Called when user logs out
   static Future<void> onUserLogout() async {
     _logger.info('onUserLogout: Function called');

firka/lib/ui/phone/screens/home/home_screen.dart

@@ -897,7 +897,7 @@ class _HomeScreenState extends FirkaState<HomeScreen>
 
   void _refreshLiveActivityOnResume() async {
     if (!_hasCompletedFirstPrefetch) {
-      logger.info('[Home] Skipping onAppOpened: first prefetch not yet complete');
+      logger.info('[Home] Skipping LiveActivity update: first prefetch not yet complete');
       return;
     }
     try {
@@ -906,13 +906,13 @@ class _HomeScreenState extends FirkaState<HomeScreen>
         settings: widget.data.settings,
       );
       final studentName = token?.studentId ?? "Student";
-      await LiveActivityService.onAppOpened(
+      await LiveActivityService.checkAndUpdateTimetable(
         client: widget.data.client,
         studentName: studentName,
         settingsStore: widget.data.settings,
       );
     } catch (e) {
-      logger.warning('[Home] LiveActivity refresh on resume failed: $e');
+      logger.warning('[Home] LiveActivity timetable update on resume failed: $e');
     }
   }