refactor: conditionalize profile fields, update chat navigation transitions, and fix provider state management during widget lifecycle

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

@@ -90,16 +90,12 @@ class _ChatScreenState extends ConsumerState<ChatScreen>
     }
   }
 
-  @override
-  @override
-  void deactivate() {
-    // Clear active conversation while ref is still valid (before dispose)
-    ref.read(messagingProvider.notifier).setActiveConversation(null);
-    super.deactivate();
-  }
-
   @override
   void dispose() {
+    // Defer provider modification to avoid "modify during build" error
+    final notifier = ref.read(messagingProvider.notifier);
+    Future.microtask(() => notifier.setActiveConversation(null));
+
     WidgetsBinding.instance.removeObserver(this);
     _connectionSub?.cancel();
     // Stop typing and leave room before disposing