animating up the timeline when sending message would make the app feel way better

i remember when we did this on Blah - it makes a world of difference. is this easy?

The issue does not name a file, test, or entry point. Start by locating the timeline UI and the message-sending flow in the iOS app, then review how the referenced animation worked in “Blah.” Done would mean an agreed animation is implemented when sending a message, but the issue does not define its behavior or acceptance criteria.

Written by the indexing model from the issue text.