App: [$500] CRITICAL: Show Join button in header when hidden

Problem: When you open a chat of any kind (eg, room, thread) you generally start out in the hidden notification frequency, meaning that you are just “previewing” the chat – you haven’t joined it, and once you leave it, you won’t be notified of any updates. The most straightforward way to join a room is to post. However, you can also explicitly “join” – and people often want to do so. However, our testing suggests that people have had trouble realizing that they hadn’t joined, or that it was needed.

Solution: Add a Join button to the right side of the header when viewing a room being previewed with with hidden notification frequency. This would look something like this, except with the button merely being Join (because this wouldn’t just be shown for threads):