docs(linter): add Playwright domain documentation

[abossenbroek]

Summary

• Adds RuleDomain::Playwright match arm to codegen/src/domains.rs so the domains page includes a description for the new Playwright domain.

Companion to biomejs/biome#8960, which introduces 11 Playwright lint rules with a new RuleDomain::Playwright.

Note on CI

CI will fail until biomejs/biome#8960 is merged and the biome crate rev is bumped in this repo's Cargo.toml. This is expected per biomejs/biome#8960 (comment).

AI disclosure

This PR was authored with the assistance of Claude Code.

🤖 Generated with Claude Code

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Walkthrough

Adds Playwright support to the domain documentation generator by extending DocDomains::write_description in codegen/src/domains.rs. A new RuleDomain::Playwright arm emits a dedicated header and a description stating the domain targets Playwright test projects and enforces Playwright best practices and common mistakes. Change is small (7 lines added) and follows existing domain patterns.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'docs(linter): add Playwright domain documentation' directly summarises the main change—adding documentation for the Playwright domain in the linter codebase.
Description check	✅ Passed	The description is fully related to the changeset, explaining the purpose of adding the Playwright domain match arm, its companion PR context, and CI expectations.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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