Publish UI test checks for comment triggers

[Kyle-Ye]

Summary

• Create PR check runs on comment-triggered UI tests so they appear in the PR Checks tab
• Mark requested platform checks queued immediately from a lightweight prepare job
• Update the check run to in-progress and final success/failure from the platform job

Validation

• ruby -e 'require "psych"; Psych.parse_file(".github/workflows/uitests.yml")'
• git diff --check

Note: actionlint is not installed locally.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR publishes PR check runs for UI tests that are triggered via issue comments, so they appear in the PR “Checks” tab.

Changes:

• Adds checks: write permission and a lightweight prepare_issue_comment job that validates /uitest … comment triggers.
• Parses the comment to determine requested platforms (iOS/macOS) and exports outputs (repo/SHA, requested flags, check run IDs).
• Creates queued check runs for same-repo PRs and links them to the workflow run via details_url.
• Updates iOS/macOS UI test jobs to depend on the prepare job and use its checkout target.
• Marks the corresponding check run in_progress when the platform job starts.
• Completes the check run with success/failure/cancelled based on job.status.

Technical Notes: Fork PRs still run the requested tests, but check run creation is skipped since checks can’t be created against fork SHAs in the base repo.

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[augmentcode]

Review completed. No suggestions at this time.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.79%. Comparing base (e14c750) to head (e299f83).
⚠️ Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (e14c750) and HEAD (e299f83). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (e14c750)	HEAD (e299f83)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #866       +/-   ##
===========================================
- Coverage   25.72%   13.79%   -11.93%     
===========================================
  Files         677      637       -40     
  Lines       47008    41270     -5738     
===========================================
- Hits        12092     5695     -6397     
- Misses      34916    35575      +659     

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