fix(composer): mentions of files like `posts.$postId.tsx` or `[id].tsx` stay chips (#22922)

Co-authored-by: Victor Vogel <satsdev@only21mil.xyz>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
5c3721e20aTheo Browne committed on 10/21/2026, 9:13:41 PM· committed by GitHubparent38d993f
4 files changedLine totals unavailable