Patch 9.66: Rooms with a lobby and their own chat

Rooms are now lobbies: pick your deck like in Play Local, challenge a player from the list or press Start game, and talk in the room's own chat.

Other changes

Join room asks only for the code. You pick your deck in the room, not before.
The room lobby is built like Play Local: your decks and the starter decks, the room code, Copy link and Main menu. The creator can close the room.
Start game waits until another player of the same room presses it too. Or pick a player from the list and challenge them directly.
Every room has its own chat channel. It opens with the room, and everyone in the room can write in it.
After a match: Play again starts the search at once, Back to lobby returns to the deck choice, Main menu leaves the room.
Rooms have no player limit and stay open as long as someone is in them; the code no longer expires after 10 minutes.