Closes#25
ui/category/:
- CategoryListViewModel: StateFlow-based ViewModel with add/delete
dialog state management, backed by CategoryRepository
- CategoryListScreen: Material 3 Scaffold with LazyColumn, FAB for
adding, delete confirmation dialog with CASCADE warning
ui/location/:
- LocationListViewModel: same pattern for LocationRepository
- LocationListScreen: same UI pattern for location management
Tests:
- CategoryListViewModelTest: 11 tests covering init, add, delete,
dialog state, blank name rejection
- LocationListViewModelTest: 11 tests (same coverage)
Dependencies:
- Added lifecycle-runtime-compose for collectAsStateWithLifecycle
- Added kotlinx-coroutines-test for ViewModel unit tests
a27660fd4a