Some changes:
- Convert most of the code to Swift.
- Update the search result section headers to “Find by Number”/“Find by
Username” instead of “Phone number search”/“Username search”.
- Remove “New message to:” from the rows & update the icons.
- Don’t look up phone numbers until the user taps the row. As a result,
there’s no “No user found. Invite via SMS?” row.
- Restore the invite via SMS feature if the user can’t be found. If a
number appears unregistered, we’ll offer to send an SMS.
- Start showing search results after 3 digits (approximately).
- Show potentially-invalid phone numbers to avoid results that disappear
if you happen to type a digit incorrectly.
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