51ece8f1c1
- playground transport: route startSession through a ref so sidebar edits (tags, machine, maxAttempts, maxDuration, version, region) made before the first send aren't silently ignored. Mirrors the existing clientDataJsonRef pattern. - chat.handover: swallow the rethrown error after the recovery path has already run so processes started with --unhandled-rejections=throw don't crash. User-facing behavior unchanged.