fix: improve chat auto-scroll logic, reduce socket timeout, and prevent duplicate message sends

lib/features/messaging/data/socket_service.dart

@@ -277,7 +277,7 @@ class SocketService {
     });
 
     return completer.future.timeout(
-      const Duration(seconds: 10),
+      const Duration(seconds: 5),
       onTimeout: () => null,
     );
   }