- 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
