fix(web): update notification tests for v2 thread shells and drop dead composer state

ThreadNotificationCoordinator presents raw OrchestrationV2ThreadShell
records, but its tests still fed the pre-v2 thread shape (session /
latestTurn), which crashed presentThreadShell on missing DateTime fields.
Rebuild the fixtures as v2 shells with pendingRuntimeRequest and run
statuses, and remove the composerHasUnsentContent binding left unused by
the compaction gating change.
4c9d7c5f18Julius Marminge committed on 9/21/2026, 5:32:51 AMparentdb525c8
3 files changedLine totals unavailable