🤖 New mini-app: **Whiteboard** 🎨 — a shared drawing board for the current chat. Run `/board` to open it, then draw together with a pick of 5 colors and 3 brush sizes; everyone in the chat sees lines appear live. `/board clear` (or the Clear link) wipes it for everyone. Like the rest of lchat, it's end-to-end encrypted — the server never sees what's drawn, only that something was.