Covers the recently fixed bugs (batch continuation on unknown convos,
accept status propagation to 'all'-status caches, rev guard against
stale writes) plus core per-log-type cache behaviors. Fixture builders
are shared for other chat test suites.
Stubs the bottom-sheet native module in jest setup: it reads
Platform.Version at import time, which jest-expo leaves undefined,
crashing any test that imports the chat/session chain.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Samuel Newman
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