Pick a layout
Three prototypes on the same live backend. Open one on your computer, scan its QR with your phone, and send something both ways.
A. Sidebarbpad's frame: code, QR and join in a sidebar; send and the list on the paper.B. Message yourselfPair first in the middle of the page, then drops read like a conversation with the box at the bottom.C. Tiles + panelThe suite standard: Send and This drop side by side, the list below, history as its own tile.