- Add quick favorites filter button on homepage with badge count
- Create dedicated favorites page with hero header and stats cards
- Implement three view modes for favorites: cards, list, alphabet
- Cards: Large 120px avatars with gradient backgrounds, full contact details
- List: 72px avatars with detail chips and hover actions
- Alphabet: Grouped by letter with quick-jump navigation
- Fix layout jump when favorites filter is active (exclude from FilterBar count)
- Add tags management feature with CRUD operations
- Reorganize import page to /data route
- Add infinite scroll to contacts list
- Add contact notes feature
- Persist favorites view mode in localStorage
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add vCard/CSV file import with duplicate detection and merge options
- Add Google Contacts OAuth2 integration for importing from Google
- Add vCard/CSV export with format selection and filtering options
- Add connected_accounts table for OAuth token storage
- Add FileUploader, ImportPreview, GoogleImport, ExportModal components
- Add i18n translations for import/export (DE/EN)