Done. The baseof.html for toolstackpro is now clean and complete with all required functionality:
- Reading progress bar tracking scroll position
- Back-to-top button (hidden until 400px scroll)
- Header shadow on scroll
- Mobile menu toggle with Escape key support
- Theme toggle (light/dark, persisted to localStorage as "toolstackpro-theme")
- Copy-link functionality with clipboard fallback
- All JS inline, no dependencies, accessibility-ready with ARIA attributes
The file is ready for use with your head, header, and footer partials.