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Ysopwnable 5047373006 feat(website): add a shared back-to-top link
Long guides and case studies now have a small `↑ Top` link at the bottom right. It appears after scrolling, returns smoothly to the page header, and moves keyboard focus back to navigation. Reduced-motion users return immediately; the native `#top` link also works without JavaScript.

The link is shared by all 11 styled website pages. The README and style guide document it, and the evidence notes retain the original browser-example digest alongside its later navigation addition.

Validation:

- Website preparation and verification: 12 HTML pages, 195 local references, SVG XML, the six-file ZIP and the sole manual Pages publisher.
- Oxfmt, `git diff --check` and `npm run check:fast` with Node.js 24.18.0.
- Focused browser checks at `/` and `/rea/`: 22 routes, 21 pointer returns, six keyboard returns, five viewport widths, smooth scrolling, reduced motion, focus return and the no-JavaScript anchor.
- Existing site interactions: 24 routes, 68 copy buttons, 20 comparison steps, two CSV exports, two ZIP downloads and eight viewport widths from 320px to 1440px. Code excerpts are unchanged.
- Desktop and mobile rendering reviewed. Downloadable Electron source and CSV export source/data are unchanged.

Publication continues through the existing manual Pages workflow after merge.
2026-10-07 23:50:31 +08:00
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