* Add style prop to UserAvatar component for better customization
* Refactor UserAvatar to use getAvatarSeed utility for consistent avatar generation
* Fix React hook ordering issues in profile/overview.tsx to prevent crashes during auth state changes
* Add proper state initialization and cleanup during authentication transitions
* Ensure consistent fallback avatar display for unauthenticated users
These changes improve stability during login/logout operations and provide better visual continuity with Robohash avatars when profile images aren't available.
- Create reusable NostrProfileLogin component for consistent UI across all screens
- Fix profile feed error when not authenticated by conditionally calling useSocialFeed
- Resolve hook ordering inconsistencies to prevent React errors
- Improve feed loading state management during authentication transitions
- Update all profile screens (overview, activity, progress, settings) to use shared component
- Add proper error handling for profile data loading when not authenticated
This change resolves the console error that appeared when accessing the profile tab
while not logged in, while also providing a better user experience through
consistent styling and messaging across all profile screens.
