## Summary
- Change the Playwright test results comment workflow to delete the
existing bot comment and create a new one, rather than updating in place
- This ensures the comment always appears at the bottom of the PR
conversation with the latest results

## Test plan
- Verify the workflow triggers correctly on CI completion
- Check that old Playwright comments are deleted and new ones are
created at the bottom of the PR thread

#skip-bugbot

🤖 Generated with [Claude Code](https://claude.com/claude-code)
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<!-- This is an auto-generated description by cubic. -->
---
## Summary by cubic
Change Playwright test results commenting to delete the previous bot
comment and post a new one. This ensures the latest results always
appear at the bottom of the PR thread.

<sup>Written for commit f066fac1aa3c3fa362a9161605901359128f72ff.
Summary will update on new commits.</sup>

<!-- End of auto-generated description by cubic. -->
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>