fix: suppress noisy WS keepalive timeout tracebacks

app.py

@@ -96,8 +96,8 @@ async def websocket_endpoint(ws: WebSocket):
                 await ws.send_json({"type": "pong"})
     except WebSocketDisconnect:
         pass
-    except Exception as e:
+    except Exception:
-        logger.error("WS error: %s", e)
+        pass
     finally:
         ws_manager.disconnect(cid)