Display Connection Failure Prompt When Large Model Dialogue Times Out or Returns Errors (e.g., 404)

[yuzcat01]

Is your feature request related to a problem? Please describe.
When interacting with a large model, sometimes due to network delays, model service instability, or interface errors (such as 404 or other errors), there’s no response for an extended period. In these cases, users are unsure whether the connection has failed or if they are just waiting, leading to a poor user experience.

Describe the solution you'd like
I would like a prompt to appear immediately when a connection times out or any error (e.g., 404) is received, informing the user of the connection failure to prevent prolonged waiting with no response. Consider triggering this prompt if no response is received within a certain time frame.

Describe alternatives you've considered

1. Add a loading indicator on the interface, and if it exceeds a specified time, prompt the user to check the network or service connection.
2. Provide a manual retry button, allowing users to manually attempt reconnection if a connection issue occurs.

Additional context
This feature would improve user experience by helping users quickly understand the connection status.