fix: open hidden docs sections for anchor links

[raviships]

Summary

Links to headings inside a collapsed section or an inactive tab did nothing.

• Component pages (OpenTabs). Radix only renders the active tab panel, so headings in the "Manual" tab (#copy-this-component, #install-required-components, …) weren't in the DOM until someone clicked the tab. Their TOC entries on all 10 component pages were dead links.
• Quick Start (SetupGuide). This already handled hash links with ~60 lines of logic that nothing else could reuse.

This PR moves that logic into a shared useRevealAnchor(containerRef, reveal) hook. A container that hides content calls it with its own "open" function:

useRevealAnchor
  on load / hashchange / same-page link click
    target = element for hash
    if target is inside container and hidden
      reveal()            // open <details> / select tab
      scroll to target

• SetupGuide now just calls the hook with details.open = true.
• OpenTabs tracks the selected tab in state. Inactive panels stay mounted but hidden with data-[state=inactive]:hidden (the same approach fumadocs uses for its Tabs), and each panel selects itself when an anchor inside it is targeted.

Any page that uses these components gets this automatically.

I also tried hiding those headings from the TOC with fumadocs' [!toc] marker. fumadocs only strips the marker when building the TOC, so it leaked into search results ("Copy this component [!toc]") and changed heading ids to #…-toc.

Evidence

Headless Chromium against the docs dev server and again against this PR's Vercel preview (production build), with identical results. In every case the heading was visible and scrolled just below the sticky header (top: 112):

Case	Result
Direct load /docs/components/dropzone#copy-this-component	Manual tab selected
hashchange into the inactive tab	Manual tab selected
TOC click on the current hash after switching back to CLI	Manual tab selected
Direct load /docs/quick-start#delete-file	Setup guide opened
Same-hash click after closing the guide	Setup guide reopened
Client navigation from /blog/v1-release to /docs/quick-start#temporary-files	Setup guide opened

pnpm --filter docs lint, Prettier and tsc pass for the changed files. No changeset: this only touches the docs site.

Risk and rollback

Door: Two-way. Reverting the commit restores the previous behavior.
Blast radius: Docs site only. Covers the Installation tabs on the 10 component pages and the Quick Start setup guide. Inactive tab panels are now server-rendered (hidden), which adds their HTML to the initial page. Their content was already in the RSC payload.

By: Claude Opus 5.5 on Claude Code

🤖 Generated with Claude Code

[vercel]

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-14T05:52:03.340359Z	01037f5	Draft marked ready

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