- Refactor useFavorites callbacks to read latest state instead of closing over stale favorites values
- Ensure add/remove/toggle flows update local state and persistence from a consistent source of truth
- Add regression tests that reproduce stale-closure timing scenarios and verify favorites remain correct
- Expand hook test coverage for rapid consecutive updates to guard against future closure regressions
- Extract modal manager, app settings, deep-link handling, favorites, and auth onboarding into dedicated hooks
- Rewire App.tsx to consume the new hooks and reduce component-level state/effect complexity
- Preserve favorite-toggle error toast behavior in the updated favorites wiring
- Add hook-level test coverage for modal manager, app settings, deep links, favorites, and auth onboarding flows
