- Optimize splash page: reduce wait to 500ms, refresh token in background
- Cache SharedPreferences instance to avoid blocking API requests
- Add global 401 handler to auto-redirect to login page
- Create shimmer loading components (ShimmerLoading, ShimmerBox, skeletons)
- Replace CircularProgressIndicator with skeleton screens across all pages
- Add keepAlive + auto-invalidation (5min) to providers to reduce API calls
- Fix trading page: invalidate globalStateProvider after trade for data sync
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
