Features added:
- Leftover media management page in admin panel with delete functionality for images and videos
- Individual file delete buttons for leftover media
- PDF to PNG conversion (each page becomes a separate image at Full HD resolution)
- Delete functionality for leftover video files
- Enhanced playlist management with duration editing for all content types
- Improved dark mode support for playlist management page
- Content type badges with color coding
- Better styling for duration input fields with save functionality
- Fixed URL generation for duration update endpoint
- Added comprehensive dark mode styling to all pages:
* Dashboard (workflow guide, secondary text, log items)
* Admin panel with user management system
* Content/playlist management page
* Upload media page
* Add player page
- Implemented user management system:
* Create/edit/delete users
* Two role types (user/admin)
* Reset password functionality
* Role-based permissions
- Replaced group assignment with playlist assignment:
* Players now directly assigned to playlists
* Updated add player form and backend
* Removed group selection from player creation
- Fixed bugs:
* Updated instance_path configuration for SQLite
* Fixed import path in app factory
* Updated dependencies (Pillow 11.0.0, removed gevent)
- Added start.sh script for easy development server launch
