- Replace kotlin.Result with AppResult across all transports and operations
- Introduce DomainTypes (PackageName, AppInfo) for type safety
- Add AppError sealed hierarchy for structured error handling
- Add SELinuxUtil for SELinux context restoration
- Add values-sw600dp and dimens.xml for tablet layout support
- Sync progress UI refactoring in BackupFragment/RestoreFragment
- BinaryResolver per-binary cache fix