Default local storage to Hive with legacy migration

docs/progress.md

@@ -20,8 +20,16 @@ Implemented a persistence boundary so local app state is no longer tightly coupl
   - schema migration hook retained and now store-agnostic
 - Added config flag for local backend selection:
   - `lib/core/config/app_config.dart` -> `USE_HIVE_LOCAL_DB`
+  - default now set to Hive (`true`)
+- Added one-time migration path from legacy shared prefs into Hive:
+  - `lib/features/local/local_repository.dart`
+  - when Hive is active and empty, legacy payload is imported then cleared
 - Added setup docs for switching local persistence backend:
   - `docs/SETUP.md`
+- Added migration/storage tests:
+  - `test/features/local/storage/local_data_store_shared_prefs_test.dart`
+  - `test/features/local/storage/local_repository_store_override_test.dart`
+  - `test/features/local/storage/local_repository_hive_migration_test.dart`
 
 This prepares the app for a true DB migration path while keeping existing UX and tests stable.