fix(web): restore pull request markdown actions

Open recognized change request links in the in-app pull request surface and restore link or unlink thread actions in the markdown context menu. Ordinary web links retain their existing browser behavior.

Audit: R21

Implemented by GPT-5.6 Sol with Codex.
7ef335b1c5Julius Marminge committed on 9/1/2026, 4:32:53 AMparent00d2b33
1 file changedLine totals unavailable