- Move recipient picker code to the correct file.
- Add a helper to fetch typed reusable table view cells.
- Only set shouldUseAsyncSelection in the one place that uses it.
- Remove some code that was duplicated between sync/async selection.
- Fix some strong references in the async preparation flow.
- Allow network errors when preparing recipients -- these may do network
fetches, and those can fail for non-interesting reasons.
- Move FindByPhoneNumberDelegate to Swift & make some code private.
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