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/logic/bookmark-pdf.ts

@@ -1,4 +1,6 @@
 // @ts-nocheck
+// TODO: @ALAM - remove ts-nocheck and fix types later, possibly convert this into an npm package
+
 import { PDFDocument, PDFName, PDFString, PDFNumber, PDFArray } from 'pdf-lib';
 import * as pdfjsLib from 'pdfjs-dist';
 import Sortable from 'sortablejs';