Switch persistence layer from Realm to SQLite (TypeORM + react-native-sqlite-storage)

[Copilot]

MongoDB Realm is deprecated and being removed in September 2025. This replaces it with TypeORM backed by react-native-sqlite-storage, which is compatible with React Native 0.71.

New: src/persistence/sqlitedb/

• entities/AttemptSchema.ts — TypeORM EntitySchema for STIF.Attempt. Indexed eventId and inspectionStart columns mirror the existing Realm query patterns; complex sub-objects (solutions, infractions, event) stored as JSON text columns. Includes rowToAttempt / attemptToRow serializers.
• entities/SolveRecordingSchema.ts — TypeORM EntitySchema for STIF.SolveRecording.
• index.ts — AppDataSource configuration + attemptsVersion global counter (via react-hooks-global-state, already a dependency) that replaces Realm's live-query observation: hooks re-fetch whenever a write bumps the counter.
• DatabaseProvider.tsx — React context provider wrapping DataSource initialization; exposes useDatabase().

Updated

• All src/persistence/hooks/ — migrated from Realm APIs to TypeORM repositories. useAttemptRestoration wraps clear()+save() in a transaction for atomicity.
• src/ui/App.tsx — RealmProvider → DatabaseProvider; Realm Flipper plugin removed.
• package.json — removes realm, @realm/react, realm-flipper-plugin-device; adds typeorm@^0.3.26, react-native-sqlite-storage@^6.0.1.

Deleted

• src/persistence/realmdb/ — replaced entirely.

Design notes

• No decorators: Uses EntitySchema throughout to avoid reflect-metadata / experimentalDecorators, which conflict with isolatedModules: true in tsconfig.json.
• Data migration path: The existing JSONL backup/restore (backup.ts / restore.ts) is unchanged and serves as the migration path for existing users — back up on the old version, restore on the new one.
• synchronize: true auto-creates tables on first launch. Future schema changes should switch to TypeORM migrations.

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