implemented chat long-polling and optimistic updates, centralized notification management, optimized avatar caching

lib/main.dart

@@ -23,6 +23,7 @@ import 'app.dart';
 import 'background/widget_background_task.dart';
 import 'firebase_options.dart';
 import 'model/account_data.dart';
+import 'routing/app_routes.dart';
 import 'share_intent/share_intent_listener.dart';
 import 'state/app/modules/account/bloc/account_bloc.dart';
 import 'state/app/modules/account/bloc/account_state.dart';
@@ -153,7 +154,9 @@ Future<void> main() async {
         ),
         BlocProvider<BreakerBloc>(create: (_) => BreakerBloc()),
         BlocProvider<ChatListBloc>(create: (_) => ChatListBloc()),
-        BlocProvider<ChatBloc>(create: (_) => ChatBloc()),
+        BlocProvider<ChatBloc>(
+          create: (ctx) => ChatBloc(chatListBloc: ctx.read<ChatListBloc>()),
+        ),
         BlocProvider<TimetableBloc>(create: (_) => TimetableBloc()),
       ],
       child: const Main(),
@@ -199,6 +202,8 @@ class _MainState extends State<Main> {
           checkerboardRasterCacheImages:
               devToolsSettings.checkerboardRasterCacheImages,
           debugShowCheckedModeBanner: false,
+          // Used by ChatView.didPopNext to reclaim the global ChatBloc.
+          navigatorObservers: [AppRoutes.chatRouteObserver],
           localizationsDelegates: const [
             ...GlobalMaterialLocalizations.delegates,
             GlobalWidgetsLocalizations.delegate,