We’ve moved away from using the expand/collapse pattern on the page
where you click ‘send’. Instead we’re putting the send button in the
sticky footer.
So it’s a bit jarring to still have the expand/collapse on the page you
see after you’ve sent an email. This commit replaces it with the sticky
footer as well.
This is only relevant for emails because:
1. Text messages are generally short enough to fit on the screen
2. We don’t show the status of letters because they don’t really change
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