greyed out messages after already sent

[h5gq3]

not sure if same issue as here https://github.com/urbit/landscape/issues/574

[jamesacklin]

Is symptomatic of a much larger issue; we need a better story about how we send state and reconcile delivery of messages. Maybe moving towards a gossip-style message delivery is the solution, but either way--this is a much larger issue and we should keep it in mind as a quarter-sized project.