* remove support for uninstalling old sunset apps
* Add color legend on app removal screen
* Remove legacy app list generator and custom apps file support
Replaced by GUI config export/import, dynamic RemovalMethod, and
CLI app removal settings saved to LastUsedSettings.json.
* Verify app removal by checking actual installation state instead of trusting winget output
This also includes:
* Update README for DisableSearchHighlights and DisableFindMyDevice
* Extracted more logic from main script into separate scripts
* Add event handler for tab changes to regenerate overview