- Replaced mock login logic in `LoginViewModel` with actual API calls using Retrofit.
- Integrated `EncryptedSharedPreferences` via a new `TokenStorage` class to securely persist access and refresh tokens.
- Added `RetrofitProvider` and `APIService` to handle network requests and JSON serialization.
- Updated `Account` entity and database schema (version 2) to include user roles, enabling destructive migration for development.
- Added necessary internet permissions and allowed cleartext traffic in `AndroidManifest.xml`.
- Included dependencies for Retrofit, OkHttp logging, and AndroidX Security.
