Fix branch query cwd for worktree threads and error banner light mode

Use worktree path instead of project cwd for git branch queries so
worktree threads correctly report their branch as current. Also update
error banner to use semantic color tokens for light mode support.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
6ce773ff1eJulius Marminge committed on 2/11/2026, 5:00:18 PMparentc5cbe15
1 file changedLine totals unavailable