Open cards lie over the dimmed chat

With the navigation pinned on the left and Obeya's chat open on the right, an open card used to squeeze into the narrow canvas between them, although the chat is dimmed and out of use while a card is open. Now a card wider than the canvas reaches over the chat and takes the window's width, so its result and conversation get the room they need. The pinned navigation stays usable beside it, and closing the card brings the chat back as it was.