- Add ContactSelector, ContactBadge, ContactAvatar to shared-ui
- Add ContactsClient API service to shared-auth
- Add ContactReference, ContactSummary types to shared-types
- Todo: Add assignee and involvedContacts to tasks with UI in TaskEditModal
- Todo: Display contacts in TaskItem and KanbanTaskCard
- Calendar: Add AttendeeSelector with RSVP status support
- Calendar: Integrate attendees in EventForm
- Calendar: Add task drag-drop to calendar views (Day/Week/MultiDay)
- Contacts: Add ContactTasks component to show related tasks
- Backend: Add findByContact endpoint to Todo task service
- UI polish: glassmorphism styling, keyboard navigation, auto-focus
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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 components
- Add ExportModal with format selection (vCard/CSV)
- Add i18n translations for import/export (DE/EN)