chore: optimize CI pnpm setup

[chenjiahan]

Summary

This PR aligns the GitHub Actions pnpm setup with the current Rsbuild workflow pattern from web-infra-dev/rsbuild#7856.

• Replace corepack/manual pnpm install steps with pnpm/action-setup@0e279bb959325dab635dd2c09392533439d90093 and run_install: true.
• Explicitly disable actions/setup-node package manager caching with package-manager-cache: false.
• Keep browser installation commands as separate post-install steps where needed.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: d02f0c80-69e3-41aa-b652-9aa1b3cdd86d

📥 Commits

Reviewing files that changed from the base of the PR and between 01e9635 and 4ddb4c6.

📒 Files selected for processing (3)

• .github/workflows/chromatic.yml
• .github/workflows/release.yml
• .github/workflows/test.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/optimize-ci-pnpm-action-20260609

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