Fix issue where canceling join left button disabled

desktop-client/main.py

@@ -104,6 +104,7 @@ class VlcSyncApp(QMainWindow):
         self.room_code = ""
         self.local_file_path = None
         self.lobby_widget.clear_file()
+        self.lobby_widget.reset_ui()
 
     def _on_room_sync_action(self, action, position_s, req_id):
         self.sync_client.send_message({"type": "sync", "action": action, "position": position_s, "req_id": req_id})
@@ -127,6 +128,9 @@ class VlcSyncApp(QMainWindow):
         if self.stacked_widget.currentIndex() == 1:
             self.room_widget.set_room_code_display(f"{self.room_code} (Reconnecting...)")
             self.room_widget.add_system_message("⚠️ Connection lost. Trying to reconnect...")
+        else:
+            self.lobby_widget.reset_ui()
+            self.pending_connect_action = None
 
     def on_room_error(self, msg: str):
         QMessageBox.critical(self, "Room Error", msg)