Cache folder takes a lot of space

[muellermartin]

Describe the bug
psst on macOS takes a lot of disk space (11 GB) after a while (about 8 months with frequent use). The cache folder does not seem to get cleaned up.

To Reproduce
Use psst for a while and observe cache folder growing in size.

Expected behavior

• psst should clean up unused cache
• it would be nice if psst would limit the cache size (maybe via an option)
• having a button to clean up the cache via settings would also be nice

Environment

• OS: macOS Ventura 13.6.1
• Version: a8922f6 (built on 2023-10-05 01:20:31.086787 +00:00)

Additional context
Add any other context about the problem here.

[Insprill]

I'm not familiar in-depth with how the caching system works, but we should definitely have a size limit and a clear button.