Display conversations all in one list

(As an option) add the possibility to show all rooms and conversations in a single list sorted by the time of the latest message (like eg. Signal does) as a start screen, rather than having three tabs for unread, conversations and rooms.

Alternatively, if this is too much work, use the same Components from those tabs but put them one under the other to have a more compact view, so it just takes one tap after starting the app to open one of your recent chats