migrated custom timetable events to Marianum-Connect and refactored push notification handling

lib/app.dart

@@ -178,22 +178,23 @@ class _AppState extends State<App> with WidgetsBindingObserver {
       if (mounted) setState(() {});
     });
 
-    TelemetryHeartbeat.report();
+    TelemetryHeartbeat.report(
+      notificationsEnabled:
+          context.read<SettingsCubit>().val().notificationSettings.enabled,
+    );
 
     // A refreshed FCM token invalidates the existing push subscription — the
     // NC device identifier stays stable, so we simply re-register (NC first,
     // then the proxy). Debounced so a burst of refreshes triggers one call.
-    if (context.read<SettingsCubit>().val().notificationSettings.enabled) {
-      _fcmTokenRefreshSub = FirebaseMessaging.instance.onTokenRefresh.listen((
-        _,
-      ) {
-        Debouncer.debounce(
-          'pushTokenRefresh',
-          const Duration(seconds: 3),
-          () => unawaited(PushRegistration().onTokenRefresh()),
-        );
-      });
-    }
+    // Not gated on the notification toggle: registration is kept alive even
+    // when notifications are off so silent sync pushes keep flowing.
+    _fcmTokenRefreshSub = FirebaseMessaging.instance.onTokenRefresh.listen((_) {
+      Debouncer.debounce(
+        'pushTokenRefresh',
+        const Duration(seconds: 3),
+        () => unawaited(PushRegistration().onTokenRefresh()),
+      );
+    });
 
     // Android renders pushes locally, so a tap arrives via the local
     // notifications callback (PushTapRouter) rather than onMessageOpenedApp.