Instead of showing a retry button on the first failure, silently re-open
the inventory stream with exponential backoff (250ms→4s, 6 attempts,
staying in the loading spinner). The startup DB-not-ready race clears in
well under a second, so the user just sees the spinner briefly and the
list appears — no tap needed. Only after the retry budget is exhausted do
we surface the manual-retry error.
Tests cover auto-recovery, no error flicker during retries, and the
give-up path (via fake_async to fast-forward the backoff).
vjrj
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