Popup on expired session

Summary

Currently when a session expires the request page stays the same. Then on pressing the refresh button one gets redirected to SSO.

On quiet labs this means that you need to actively click inside the queue to make sure that your session does not expire.

It would therefore be nice if a popup would show telling the session has expired.

Reasoning

When the queue is quiet and the session expires it is unknown wether there are (still) no requests or if the session expired. This will make sure that no requests are missed.