Fix ws error receive and send

engine/app/main.py

@@ -190,6 +190,12 @@ async def websocket_endpoint(websocket: WebSocket):
         # Receive loop
         while True:
             message = await websocket.receive()
+            message_type = message.get("type")
+
+            if message_type == "websocket.disconnect":
+                logger.info(f"WebSocket disconnected: {session_id}")
+                break
+
             last_received_at[0] = time.monotonic()
 
             # Handle binary audio data