Mark a session as completed/closed

### Feature summary

Add menu item to close a session

### What problem are you trying to solve?

Currently I can only archive or delete a session, (which probably removes them from disk).
The grey "open" color indicates "work in progress" for me, so I keep opening those sessions, even while I consider them done.

Dismissing the session (complete/close works as well) saves me time and switching

### Proposed solution

Allow the user to mark the session as completed, and use a different icon for it

### Workflow impact

_No response_

### Installation context

_No response_

### Additional context

_No response_