4bc4267e5a36e37e54b9afb271f9304420a84463
Adds the structured error code returned when a rename rolls back because a referenced transcription block was edited concurrently (OptimisticLockException on transcription_blocks.version). Mirrors the contract in frontend src/lib/errors.ts and adds the localised message keys error_person_rename_conflict in de/en/es so the UI surfaces a retry hint instead of a generic 500. The actual translation of OptimisticLockException → DomainException (PERSON_RENAME_CONFLICT) lands in the next commit alongside the integration test that proves the rollback semantics. Refs #362 Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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