feat(bookmark): improve pdf bookmark tool ui with dark mode and drag-drop

- Add dark mode styling to the bookmark tool page
- Implement drag-and-drop file upload zones for PDF, CSV and JSON
- Enhance file input UI with icons and better visual feedback
- Fix formatting and whitespace issues in multiple files

src/js/config/tools.ts

@@ -78,11 +78,10 @@ export const categories = [
       },
       {
         // id: 'bookmark-pdf',
-        href: '/src/pages/bookmark.html', 
+        href: '/src/pages/bookmark.html',
         name: 'Edit Bookmarks',
         icon: 'bookmark',
-        subtitle:
-          'Add, edit, import, delete and extract PDF bookmarks.',
+        subtitle: 'Add, edit, import, delete and extract PDF bookmarks.',
       },
       {
         id: 'add-page-numbers',