feat(runtime): export useHead hook from @rspress/core/runtime

[SoonIter]

Summary

• export useHead from @rspress/core/runtime
• add English and Chinese documentation for the useHead runtime hook
• update the custom head guide to document both Head and useHead

Testing

• pnpm --filter @rspress/core build (currently fails on an existing unrelated type error in src/node/mdx/options.ts: MarkdownOptions.defaultCodeOverflow)
• npx heading-case --write website/docs/en/ui/hooks/use-head.mdx website/docs/zh/ui/hooks/use-head.mdx website/docs/en/ui/runtime-components/head.mdx website/docs/zh/ui/runtime-components/head.mdx website/docs/en/guide/advanced/custom-head.mdx website/docs/zh/guide/advanced/custom-head.mdx

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[github-actions]

Rsdoctor Bundle Diff Analysis

Found 3 projects in monorepo, 3 projects with changes.

📊 Quick Summary

Project	Total Size	Change
node	12.6 MB	+115.9 KB (0.9%)
web	16.3 MB	+29.1 KB (0.2%)
node_md	1.6 MB	+7.5 KB (0.5%)

📋 Detailed Reports (Click to expand)

📁 node

Path: website/doc_build/diff-rsdoctor/node/rsdoctor-data.json

📌 Baseline Commit: 9129469c70 | PR: #3271

Metric	Current	Baseline	Change
📊 Total Size	12.6 MB	12.5 MB	+115.9 KB (0.9%)
📄 JavaScript	0 B	0 B	0
🎨 CSS	0 B	0 B	0
🌐 HTML	12.6 MB	12.5 MB	+115.9 KB (0.9%)
📁 Other Assets	0 B	0 B	0

📦 Download Diff Report: node Bundle Diff

📁 web

Path: website/doc_build/diff-rsdoctor/web/rsdoctor-data.json

📌 Baseline Commit: 9129469c70 | PR: #3271

Metric	Current	Baseline	Change
📊 Total Size	16.3 MB	16.2 MB	+29.1 KB (0.2%)
📄 JavaScript	16.0 MB	16.0 MB	+28.4 KB (0.2%)
🎨 CSS	122.1 KB	122.1 KB	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	167.9 KB	167.2 KB	+749.0 B (0.4%)

📦 Download Diff Report: web Bundle Diff

📁 node_md

Path: website/doc_build/diff-rsdoctor/node_md/rsdoctor-data.json

📌 Baseline Commit: 9129469c70 | PR: #3271

Metric	Current	Baseline	Change
📊 Total Size	1.6 MB	1.6 MB	+7.5 KB (0.5%)
📄 JavaScript	0 B	0 B	0
🎨 CSS	0 B	0 B	0
🌐 HTML	0 B	0 B	0
📁 Other Assets	1.6 MB	1.6 MB	+7.5 KB (0.5%)

📦 Download Diff Report: node_md Bundle Diff

Generated by Rsdoctor GitHub Action

[Copilot]

Pull request overview

This PR aligns @rspress/core/runtime’s public API with the underlying @unhead/react runtime by re-exporting the useHead hook alongside the existing Head export, enabling consumers to import useHead directly from the Rspress runtime entrypoint.

Changes:

• Re-export useHead from @unhead/react via @rspress/core/runtime.
• Keep the runtime export surface consistent with existing head-management usage patterns.

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