## Why
Backgrounding a Claude session creates a continuation that includes its history. Offering both sessions for import duplicates that history.
## What changed
Skip sessions containing a `continued-in` record with a nonblank `continuedInSessionId` during import detection, leaving the continuation available for import.
## Testing
Add detection and app-server regression tests covering continuation-only detection, importing the full history into one thread, and no remaining import candidates afterward.
GitOrigin-RevId: bf8383faadce984ae3c41a0b8e8b3072680fd4b2