fix(server): a rollback blocked by Git's index lock says so instead of a generic error (#11340)

Co-authored-by: PR Batch Tester <agent@local.test>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Julius Marminge <julius0216@outlook.com>
9448aa572ashivam committed on 10/19/2026, 5:34:16 PM· committed by GitHubparent52c76c6
5 files changedLine totals unavailable