feat: enhance backup and restore functionality with integrity checks and progress tracking

- Added support for backup integrity verification during export and restore processes.
- Introduced progress dispatching for backup export and restore operations.
- Implemented new API endpoints for inspecting remote backup integrity.
- Enhanced user interface with progress indicators and warning dialogs for integrity issues.
- Updated localization strings for new features and user feedback.
- Refactored backup-related functions for better clarity and maintainability.

webapp/src/lib/app-support.ts

@@ -17,6 +17,7 @@ export interface WebVaultSignalRInvocation {
       UserId?: string;
       Date?: string;
       RevisionDate?: string;
+      [key: string]: unknown;
     };
   }>;
 }