- Create contactsController similar to bookmarkController
- Manage friends/contacts list in one place across the app
- Auto-load contacts on login, cache results per pubkey
- Stream partial contacts as they arrive
- Update App.tsx to subscribe to contacts controller
- Update Debug.tsx to use centralized contacts instead of fetching directly
- Reset contacts on logout
- Contacts won't reload unnecessarily (cached by pubkey)
- Debug 'Load Friends' button forces reload to show streaming behavior
