test(mobile): mock the outbox atom in the thread-order suite

The pending-order refresh now reads queuedThreadKeysAtom, whose module
reaches expo storage. The suite already mocks its other native-backed
inputs; give this one the same treatment.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
0a32f09345Julius Marminge committed on 9/6/2026, 10:52:30 PMparentef21dce
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