- Replaced `SettingsPageClient` with `SettingsIndexPageClient` to fetch and display user preferences on the settings page.
- Integrated `userPreferencesService` to retrieve all preferences asynchronously, enhancing data handling.
- Refactored theme management in `ThemeContext` to use `updateViewPreferences` for saving theme changes, improving error handling and user feedback.
- Marked the task for creating dedicated config sub-pages as complete in TODO.md.
- 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.
