refactor: implement lazy initialization for global BlocProviders and enhance Firebase initialization with timeout handling

lib/features/notifications/presentation/notifications_screen.dart

@@ -24,6 +24,14 @@ class _NotificationsScreenState extends State<NotificationsScreen> {
   void initState() {
     super.initState();
     _scrollController.addListener(_onScroll);
+    // Инициализация NotificationsCubit при первом открытии экрана
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      final cubit = context.read<NotificationsCubit>();
+      final state = cubit.state;
+      if (state is! NotificationsStateLoaded && state is! NotificationsStateError) {
+        cubit.getNotifications();
+      }
+    });
   }
 
   @override