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

lib/notification/notification_controller.dart

@@ -1,11 +1,19 @@
+import 'dart:async';
+
 import 'package:firebase_messaging/firebase_messaging.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
 
+import '../state/app/modules/chat/bloc/chat_bloc.dart';
 import '../widget/debug/debug_tile.dart';
 import '../widget/debug/json_viewer.dart';
 import '../widget/info_dialog.dart';
 import 'notification_tasks.dart';
 
+// `vm:entry-point` on the class so AOT tree-shaking doesn't drop it: the
+// FCM background handler runs in a fresh isolate that looks up the class
+// by name from native code.
+@pragma('vm:entry-point')
 class NotificationController {
   // Notification display is handled by the Firebase SDK using server-generated payloads.
   @pragma('vm:entry-point')
@@ -17,8 +25,21 @@ class NotificationController {
     RemoteMessage message,
     BuildContext context,
   ) async {
-    NotificationTasks.updateProviders(context);
+    final pushToken = _extractChatToken(message);
+    final activeToken = context.read<ChatBloc>().state.data?.currentToken ?? '';
+    final chatIsOpen =
+        pushToken != null && pushToken.isNotEmpty && pushToken == activeToken;
+
     NotificationTasks.updateBadgeCount(message);
+
+    if (chatIsOpen) {
+      // Long-poll already fetches the message and moves the marker; just
+      // dismiss any tray entry that slipped through foreground rendering.
+      unawaited(NotificationTasks.clearNotificationsForChat(pushToken));
+      return;
+    }
+
+    NotificationTasks.updateProviders(context);
   }
 
   static Future<void> onAppOpenedByNotification(