feat(contacts): integrate contacts into Todo and Calendar apps

- 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

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

packages/shared-ui/package.json

@@ -38,6 +38,7 @@
 		"@manacore/shared-branding": "workspace:*",
 		"@manacore/shared-icons": "workspace:*",
 		"@manacore/shared-theme": "workspace:*",
+		"@manacore/shared-types": "workspace:*",
 		"d3-force": "^3.0.0",
 		"d3-selection": "^3.0.0",
 		"d3-transition": "^3.0.0",