fix

lib/features/messaging/presentation/screens/chat_screen.dart

@@ -44,10 +44,21 @@ class _ChatScreenState extends ConsumerState<ChatScreen>
       final notifier = ref.read(messagingProvider.notifier);
       notifier.setActiveConversation(widget.conversationId);
       notifier.loadMessages(widget.conversationId);
-      notifier.markAsRead(widget.conversationId);
       // Initialize mute/star state from conversation data
       final conversations = ref.read(messagingProvider).conversations;
       final conv = conversations.where((c) => c.id == widget.conversationId).firstOrNull;
+      // Only mark as read when (a) there are actually unread messages and
+      // (b) the user stays on the chat long enough to be considered "viewing"
+      // it. If they accidentally tap a tile and bounce back, `mounted` will
+      // be false and we skip the read receipt — avoiding false blue ticks.
+      final hasUnread = (conv?.unreadCount ?? 0) > 0;
+      if (hasUnread) {
+        Future.delayed(const Duration(milliseconds: 600), () {
+          if (mounted) {
+            notifier.markAsRead(widget.conversationId);
+          }
+        });
+      }
       if (conv != null) {
         final currentUserId = ref.read(currentUserIdProvider);
         final isUser = conv.userId == currentUserId;
@@ -91,11 +102,20 @@ class _ChatScreenState extends ConsumerState<ChatScreen>
   }
 
   @override
-  void dispose() {
-    // Defer provider modification to avoid "modify during build" error
-    final notifier = ref.read(messagingProvider.notifier);
-    Future.microtask(() => notifier.setActiveConversation(null));
+  void deactivate() {
+    // Clear active conversation BEFORE the widget tree is disposed so the
+    // messaging_provider's onNewMessage listener immediately stops
+    // auto-marking incoming messages as read for this chat. dispose() runs
+    // too late and used a microtask which created a race window.
+    try {
+      ref.read(messagingProvider.notifier).setActiveConversation(null);
+    } catch (_) {}
+    PushNotificationService().activeConversationId = null;
+    super.deactivate();
+  }
 
+  @override
+  void dispose() {
     WidgetsBinding.instance.removeObserver(this);
     _connectionSub?.cancel();
     // Stop typing and leave room before disposing
@@ -272,8 +292,7 @@ class _ChatScreenState extends ConsumerState<ChatScreen>
   }
 
   void _handleBack() {
-    final notifier = ref.read(messagingProvider.notifier);
-    Future.microtask(() => notifier.setActiveConversation(null));
+    // deactivate() will clear activeConversationId — no need to do it here.
     if (Navigator.of(context).canPop()) {
       Navigator.of(context).pop();
     } else {