feat: enhance backup and download functionalities

- Updated `BackupCenterPage` to support download progress tracking during remote backup downloads.
- Modified `ImportPage` to simplify export functionality by removing unnecessary payload handling.
- Improved `JwtWarningPage` to utilize a new clipboard utility for copying text with feedback.
- Enhanced `PublicSendPage` to show download progress for files being downloaded.
- Updated `RecoverTwoFactorPage` to include autocomplete attributes for better user experience.
- Refactored `SendsPage` to use the new clipboard utility for copying access URLs.
- Enhanced `SettingsPage` to utilize the clipboard utility for copying sensitive information.
- Improved `TotpCodesPage` to use the clipboard utility for copying TOTP codes.
- Updated `VaultPage` and related components to support download progress for attachments.
- Introduced a new `app-notify` module for consistent notification handling across the application.
- Created a `clipboard` utility for improved clipboard interactions with user feedback.
- Added progress tracking for file downloads in the API layer, enhancing user experience during downloads.

webapp/src/lib/clipboard.ts

@@ -0,0 +1,36 @@
+import { dispatchAppNotify } from '@/lib/app-notify';
+import { t } from '@/lib/i18n';
+
+interface CopyTextOptions {
+  successMessage?: string;
+  errorMessage?: string;
+  emptyMessage?: string;
+  notify?: boolean;
+  onSuccess?: () => void;
+  onError?: () => void;
+}
+
+export async function copyTextToClipboard(value: string, options: CopyTextOptions = {}): Promise<boolean> {
+  const text = String(value || '');
+  if (!text.trim()) {
+    if (options.notify !== false) {
+      dispatchAppNotify('warning', options.emptyMessage || t('txt_nothing_to_copy'));
+    }
+    return false;
+  }
+
+  try {
+    await navigator.clipboard.writeText(text);
+    options.onSuccess?.();
+    if (options.notify !== false) {
+      dispatchAppNotify('success', options.successMessage || t('txt_copied'));
+    }
+    return true;
+  } catch {
+    options.onError?.();
+    if (options.notify !== false) {
+      dispatchAppNotify('error', options.errorMessage || t('txt_copy_failed'));
+    }
+    return false;
+  }
+}