Also made some styling changes and tweaked the room head to better
differentiate between the Name and JID of a room.

so that slider does not have fixed height after being opened and can therefore
shrink or expand appropriately when its children change.

As a result we can again show emoji categories and skin tones on the same line
(if there is enough space).

Also make sure room name gets saved once it's been updated.

Noticed that Slack sends error messages back in response to chat state
notifications.

We're not doing anything with them currently and they bloat the sessionStorage

in favor of `visible_toolbar_buttons.emoji`.

It will now also no longer be included in the full bundle.