Created by Claude, will be reviewed by @fregante first.

Part of #10253.

Test URLs

• Repo PR list: https://github.com/refined-github/sandbox/pulls?q=is%3Apr+non+default
• Repo issue list: https://github.com/refined-github/sandbox/issues?q=is%3Apr+non+default
• Global PR list: https://github.com/pulls?q=is%3Apr+repo%3Arefined-github%2Fsandbox+non+default
• Global issue list: https://github.com/issues?q=is%3Apr+repo%3Arefined-github%2Fsandbox+non+default
• Stacked PRs: https://github.com/carousell/rgh-stacked-pr-sandbox/pulls

Checked

The title link selector already matched; the badge was never added because the metadata row lookup still used the old Description class prefix.

• Logged out, repo PR list (/pulls?q=is:pr non default) with the built extension: 6 "To " badges (0 before).
• Not checked: issue list and global lists (client-rendered, need login). Reviewer: please check those test URLs, in particular that list-row-repo-name-and-number is still the issue list's metadata row.