[Bug]: After removing tags from notes, the tags still appear in the tags window despite being associated with no note. #616

Describe the bug

1. I added tags to several notes for quick access. Like GitHub, Gemini, API Keys, Etc.
2. Later on I decided to clean up my tags and removed them from their associated notes.
3. The tags still appear on the bottom left tags list despite being associated with no notes.
4. How do I clean up my tag list and/or delete the tags that are associated with no notes?

To reproduce

1. Add a tag to a note.
2. Observe the tag appears in the tag list in the bottom left of the app.
3. Remove the same tag from a note.
4. Notice that the tag still appears in the tag list, and persists after a restart of MassCode.

App Version and Architecture

4.2.0

System info

OS: Windows 11 10.0.26100
CPU: (32) x64 AMD Ryzen 9 9950X 16-Core Processor
Memory: 27.06 GB / 63.58 GB

Validations

• Follow our Code of Conduct
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.