chore(ci): use preinstalled Chrome for browser tests

[chenjiahan]

Summary

CI currently downloads Playwright's Chromium even though the hosted runner already provides Chrome.

This PR configures all Rstest browser examples to launch the preinstalled Chrome when GITHUB_ACTIONS is set and removes the redundant Playwright browser installation step. Local development continues to use Playwright's default Chromium.

[coderabbitai]

📝 Walkthrough

Walkthrough

The CI workflow no longer installs Playwright Chromium. Browser test configurations select the runner’s existing Chrome channel when CI is set. Outside CI, the configurations leave browser provider options undefined.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly describes the main CI change: browser tests use the preinstalled Chrome browser.
Description check	✅ Passed	The description accurately explains the CI configuration changes and the preserved local development behavior.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chenjiahan/chore-ci-system-chrome

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[chatgpt-codex-connector]

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