Timothy DeHerrera 98977136c8 feat(docs): add CSS-only scrollspy for TOC navigation ...

Use CSS Overflow Level 5 properties (scroll-target-group, :target-current)
to highlight the current section in the sidebar TOC as the user scrolls.

Progressive enhancement: gracefully degrades in unsupported browsers
(Firefox, Safari) — they retain existing hover/click behavior.

Browser support: Chrome 140+, Edge 140+, Opera 124+ (~65% global).

2026-02-04 11:26:49 -07:00

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