Closes #367
## What changed
- drain Today operations added while a shared flush is already in flight
- continue with later valid edits after dropping only a 409-rejected operation
- fail safely if a delivery receipt cannot be persisted
- rotate the offline shell cache so installed clients receive the fix
## Verification
- RED: in-flight second edit remained pending and only the first PATCH was sent
- RED: a 409 stranded the following remove operation
- GREEN: focused synchronization/service-worker coverage passed
- Full suite: `698 passed in 29.35s`
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Closes #367
What changed
Verification
698 passed in 29.35s