Fusion 4b51161310 fix(FN-2534): prevent dismissed background sessions from resurfacing ...

- Add dismissal tombstone tracking in useBackgroundSessions to ignore stale refresh, sync, and SSE updates for dismissed session IDs
- Treat terminal session states consistently and broadcast completion on dismiss so local/session-sync state remains converged
- Keep lock-conflicted planning cancellations visible instead of falsely dismissing the session when another tab owns the lock
- Expand useBackgroundSessions regression tests to cover stale sync/SSE resurrection, refresh behavior, lock-conflict handling, and newer-authoritative restore paths

2026-04-25 15:17:52 -07:00

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