(feat) new icons for PR markdown (#4710)

<!-- CURSOR_SUMMARY -->
> [!NOTE]
> **Low Risk**
> No functional changes are visible in the diff, so review risk is
minimal; if this is unintended, ensure the correct diff/files are
included.
>
> **Overview**
> This PR contains no effective code changes in the provided diff (it
only shows `+++ /dev/null`, with no added/modified files or hunks to
review).
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
8a82ab29ef6129fc7801e1e3cde1b7557e8489f8. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

GitOrigin-RevId: e35a124344e7668e2898dc2f432cfafd794534f6

Author: tphoney