Android Phase D & E: Auth Screen, SyncEngine, Lists & Detail Screens
- Auth UI & Logic: AuthScreen (Login/Register), AuthViewModel, AuthRepository, SessionManager
- SyncEngine: HybridLogicalClock (client-side), SyncWorker (outbox drain + server cursor pull), SyncManager
- Repository Layer: ShoppingRepository for local-first Room mutations + op_log outbox queue
- Screens & UI: ListsScreen (list overview & creation dialog), ListDetailScreen (checked/open sectioning, autocomplete AddItemBar)
- Navigation: MainNavigation (AuthNavKey -> ListsNavKey -> ListDetailNavKey)
- Verification: ./gradlew assembleDebug & ./gradlew test green ✅