docs(genui): fix playground links

[dajiaohuang]

Summary

• replace six A2UI README/guide links that currently open a 404 page with the deployed GenUI playground URL
• update the matching repository instruction so future generated README links preserve the working external target
• keep the English and Chinese documentation pairs synchronized

Fixes #3640

Validation

• node_modules/.bin/dprint check on all seven changed Markdown files
• git diff --check
• verified https://lynxjs.org/genui returns HTTP 404
• verified https://lynx-stack.dev/genui/ returns HTTP 200 and renders the live playground
• verified zero tracked occurrences of the old URL and seven occurrences of the replacement across the changed documentation/instruction files

Checklist

• Tests updated (or not required — link-only documentation correction).
• Documentation updated.
• Changeset added (or not required — no package behavior or published API changes).

Summary by CodeRabbit

• Documentation
  • Updated English and Chinese GenUI documentation links to the new GenUI Playground address.
  • Corrected links in the A2UI README files, overview guides, and catalog guides.
  • Updated documentation guidance to use the new Playground URL for generated Markdown links.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7cd0755

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 27fb6989-73d0-4d13-a5fb-d94cbcb0f91e

📥 Commits

Reviewing files that changed from the base of the PR and between 7fc85e1 and c0efdc8.

📒 Files selected for processing (7)

• .github/a2ui-catalog.instructions.md
• packages/genui/a2ui/README.md
• packages/genui/a2ui/README_zh.md
• packages/genui/a2ui/docs/catalog-guide.md
• packages/genui/a2ui/docs/catalog-guide_zh.md
• packages/genui/a2ui/docs/overview.md
• packages/genui/a2ui/docs/overview_zh.md

Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review.

---

📝 Walkthrough

Walkthrough

The A2UI instruction file and six English and Chinese documents now link to the GenUI playground at https://lynx-stack.dev/genui/. Toolbar and navigation targets remain /genui.

Changes

A2UI GenUI playground links

Layer / File(s)	Summary
Update GenUI playground links .github/a2ui-catalog.instructions.md, packages/genui/a2ui/README*.md, packages/genui/a2ui/docs/*	Updated the GenUI playground links in guidance, README files, and catalog and overview documentation. The instruction file retains /genui for toolbar and navigation links.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to c0efd

This localized documentation change replaces broken playground links and keeps related instructions and translations synchronized; no actionable merge-blocking risk remains after normal checks.

Suggested reviewers: pupiltong

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[cla-assistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ HuJean
❌ dajiaohuang
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[upupming]

@dajiaohuang Could you please sign the cla