* Remove blank header from video room view frame
* Add video room option to space context menu
* Remove duplicate tooltips from face piles
* Factor RoomInfoLine out of SpaceRoomView
* Factor RoomPreviewCard out of SpaceRoomView
* Adapt RoomPreviewCard for video rooms
* "New video room" → "Video room"
* Add comment about unused cases in RoomPreviewCard
* Make widgets in video rooms mutable again to de-risk future upgrades
* Ensure that the video channel exists when mounting VideoRoomView
Lazy Loading emits a RoomState.members for each member which in the case of a room like
Matrix HQ means it happens over 8000 times in a very short span of time causing the UI
to lock up.