VSCode desktop supportsxdg-open for URLs from its terminal, and other similar things likenpm webpack serve --open. WebTerminal does not.

The way VSCode does this is by adding aBROWSER environment variable that points to a script that can signal the vscode process running on the remote workspace, which in turn signals the desktop IDE to open the browser.

We could implement a similar feature in WebTerminal, except that we would signal the Coder Agent, which could then send the open request back to the WebTerminal over the reconnectingpty websocket.