- Implemented BackgroundSetting component for managing app and reader background images.
- Added functionality to import local images, set as app/reader background, and delete images.
- Integrated background image handling in the launch utility to apply app background on startup.
- Enhanced the Background component to support dynamic background images based on user settings.
- Created CSS styles for background settings UI, including image grid and preview overlay.
- Added utility functions for image management, including saving, loading, and deleting images.
troyeguo