- Added theme context and provider for light/dark mode support.
- Integrated theme toggle button in the Header component.
- Updated UI components to utilize CSS variables for consistent theming.
- Enhanced Kanban components and forms with new theme styles for better visual coherence.
- Adjusted global styles to define color variables for both themes, improving maintainability.
- Added `loadPopularTags` function to fetch and display popular tags when the input is empty.
- Updated `TagInput` to show suggestions based on input focus and improved suggestion display with a grid layout.
- Adjusted styles for better visual clarity and user experience.
- Marked multiple tasks as completed in TODO.md related to tag management features.
- Replaced manual tag input with `TagInput` component in `CreateTaskForm`, `EditTaskForm`, and `QuickAddTask` for better UX.
- Updated `TaskCard` to display tags using `TagDisplay` with color support.
- Enhanced `TasksService` to manage task-tag relationships with CRUD operations.
- Integrated tag management into the global context for better accessibility across components.
