Can't fix issue with stop if queued

app.py

@@ -5,5 +5,5 @@ if __name__ == "__main__":
     # Note: Engine creation is now handled per-session inside build_interface
     demo = build_interface()
     print("Starting Gradio App with Multi-User Support...")
-    demo.queue(default_concurrency_limit=None)
+    demo.queue() # Enable queueing for concurrent request handling
     demo.launch()