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/components/JwtWarningPage.tsx

@@ -1,5 +1,6 @@
 import { useMemo, useState } from 'preact/hooks';
 import { AlertTriangle, Copy, RefreshCw } from 'lucide-preact';
+import { copyTextToClipboard } from '@/lib/clipboard';
 import StandalonePageFrame from '@/components/StandalonePageFrame';
 import { t } from '@/lib/i18n';
 
@@ -55,8 +56,10 @@ export default function JwtWarningPage(props: JwtWarningPageProps) {
                 type="button"
                 className="btn btn-secondary"
                 onClick={async () => {
-                  await navigator.clipboard.writeText(generatedSecret);
-                  setCopyHint(t('txt_copied'));
+                  await copyTextToClipboard(generatedSecret, {
+                    onSuccess: () => setCopyHint(t('txt_copied')),
+                    onError: () => setCopyHint(t('txt_copy_failed')),
+                  });
                   window.setTimeout(() => setCopyHint(''), 1500);
                 }}
               >