- Add config/appx.json with curated list of removable AppX packages
- Add AppX Removal tab (WPFTab6) with Select All, Clear, and Remove buttons
- Reuse existing Invoke-WPFUIElements engine for minimal code footprint
- Add Invoke-WPFAppxRemoval.ps1 for background runspace package removal
- Add theme colors for the new tab button in light and dark modes
* fix: cast selections to string to prevent PSCustomObject type issues
* fix(presets): clear existing selections before importing to replace state instead of merging
* refactor(impex): warn user when exporting empty selections or importing empty config