Vadym Samoilenko dc1cfd01dc feat(l3): optimistic locking for VTT edits (ETag / 409 Conflict) ... Backend: - VttContentResponse gets etag field (SHA1 of captions+AD content) - VttUpdateRequest gets if_match field (optional) - GET /jobs/{id}/vtt: computes and returns etag - PATCH /jobs/{id}/vtt: if if_match present, fetches current content, recomputes hash, returns 409 Conflict if mismatch Frontend: - VttContentResponse type + VttUpdateRequest type updated - QCDetail stores vttEtag from GET response - All updateVttMutation calls pass if_match: vttEtag - 409 responses show specific "Conflict: another user has modified" message Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>		2026-04-29 19:01:57 +01:00
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v1	feat(l3): optimistic locking for VTT edits (ETag / 409 Conflict)	2026-04-29 19:01:57 +01:00