- Add authGoogleNew GraphQL mutation and token exchange in AuthServiceImpl
- Add ApiTokenStore and SharedPreferencesApiTokenStore for API token persistence
- Add ApolloAuthInterceptor to inject Bearer token on GraphQL requests
- Introduce FirebaseSessionManager for testable Firebase auth orchestration
- Update LoginViewModel to surface backend auth errors
- Add unit tests for Firebase failure, backend failure, and auth state
Made-with: Cursor