When you read messages in a narrow and then un-narrow, collapse
adjacent messages read in the narrow into a summary row that can
be clicked to expand those messages.
Scoped to staging with feature flags.
The implementation of this within our current MessageList is rather ugly.
(imported from commit bcb3a39d8c0c334136fe86318f18ead03f0f50bf)
For now, we just get emails about referrals that we have to follow up
on manually.
I don't love using the name "referral" in some places and "invite" in
others, but we already use the verb "invite" to mean something else
and "invite" is a canonical noun.
(imported from commit 0814c18395952fcdef234c1584984f71ca1b6f37)
Gone are the days of having to laboriously look up the Unicode
for each icon when you need it!
(imported from commit 35ce9c2626ac1ff0b5f4e7d6679129e8d533033e)