- Added functionality for users to select and customize background images in settings, including predefined options and URL uploads.
- Updated `ViewPreferences` to store background image settings and modified `userPreferencesService` to handle updates.
- Enhanced global styles for improved readability with background images, including blur and transparency effects.
- Integrated `BackgroundImageSelector` component into settings for intuitive user experience.
- Refactored `Card` components across the app to use a new 'glass' variant for better aesthetics.
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