- Implemented a new `favorites` table in the database schema to store user favorites.
- Added API endpoint to toggle favorite status for cards.
- Enhanced card listing to include favorited status for the current user.
- Created service functions to manage favorites, including toggling and listing favorites.
- Updated migrations to include the new `favorites` table and its associated indexes.
- Added CategoryTreeNode component to display hierarchical categories with expand/collapse functionality.
- Introduced ContextMenu component for right-click actions on categories, including add, rename, and delete options.
- Developed LeftSidebar component to integrate tools and categories, enhancing user navigation experience.
- Created home layout to structure the main application view with a top navigation bar and content area.
- Updated about page with dialog testing examples and improved UI for toast notifications.
- Enhanced index page with dynamic category management and responsive design for better usability.
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