Add the ability to update last saved session

[navorite]

Describe the problem

Currently there's only 2 options, either to save a session or to delete it. One might want to update the session that was last saved instead of saving a new one and deleting the last one.

Describe the proposed solution

Add the option to update the last saved session with the current one.

Alternatives considered

No response

Importance

Would make my life easier (2)