🔐 docs: Document the Sign-In Appearance Keys

[berry-13]

Summary

Documents the five appearance keys LibreChat-AI/LibreChat#16939 added for the sign-in pages: authFieldHeight, authButtonHeight, authControlRadius, authActionHeight and authActionRadius. The appearance table gains a row for each with the default from the theme registry and the fallback chain the resolver applies (authControlRadius follows radius2xl; authActionHeight follows authButtonHeight, then buttonHeight; authActionRadius follows authControlRadius, then radiusLg). The three heights join the minimum-target-size bullet under accepted values, since the validator rejects anything under 24px, and the ClickHouse theme summary notes that its 2rem control height covers the sign-in controls too.

Change Type

• Documentation update

Testing

• Checked every default, fallback and validator against packages/client/src/theme/registry.ts, packages/data-provider/src/theme.ts and packages/client/src/theme/themes/clickhouse.ts on LibreChat dev.
• npx prettier --check on the changed page: clean.

Checklist

• My changes follow the style of the surrounding entries
• I have checked the values against the source

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Project	Deployment	Actions	Updated
librechat-ai	Ready	Preview	Oct 10, 2026 9:27am UTC

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-10T09:21:27.472101Z	76d5aa5	Draft marked ready
🔒 Security Review	✅ Completed 2026-10-10T09:20:23.557211Z	76d5aa5	Draft marked ready

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[github-actions]

📦 Next.js Bundle Analysis for librechat.ai

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌

[github-actions]

📦 Next.js Bundle Analysis for librechat.ai

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌