[Feature] When password enabled, clear screen after timeout

[ariv-x]

Is your feature request related to a problem? Please describe.

If, for some reason, the computer's screenlock is inhibited, Stash contents might be visible to someone on the screen even hours later.

Describe the solution you'd like

Currently, when auth times out, nothing changes until you try a new access. It would be reassuring if, instead, the page would clear and return to the password prompt screen.