File written to `toolstackpro/layouts/_default/baseof.html`. Key additions over the previous version: - `lang="en"` + `no-js` class (removed by JS on load) - GA4 tag (`G-Y5300ZNVY6`) in `` - Skip-to-content link (`#main-content`) - Reading progress bar `

` with ARIA attributes + scroll JS - Back-to-top `