When the agent is streaming, the send button becomes a red stop button
that sends a { type: "stop" } WebSocket message. The server handles this
by calling ctx.abort() to cancel the current agent operation.
Use the 'qrcode' npm package instead of shelling out to the 'qrencode'
binary. Load via createRequire for ESM/CJS interop. Use margin: 2 to
avoid the utf8 renderer's invalid array length bug with odd margins.
/remote-control now opens a select menu with Turn on/off,
Configure URL, and Status instead of relying on subcommands.
Adds ability to stop the server. Shows current URL in the
Configure URL menu item and in the input dialog title.
Yejun Su