New cast composer UX on Warpcast mobile:

Preview and Undo

- Similar to Twitter, casts now preview what they will look like with the option to Undo

- Reminder to add a channel if it's not already in one

Why make Undo the default button?

That's what Twitter does and if we change the ordering people who are used to Twitter will complain. This happened when we added the recast button after the like button. Muscle memory is a thing.

We may add the ability to disable this screen in the future, but no immediate plans.

Why not move up the send / unto buttons like Twitter? 

Right now the cast button is at the top right but undo is at bottom right

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Need to clean up to stick it on the bottom of the cast preview box.