The preview is a pane inside the chat

The agent is building a landing page in your container. You want to see it. Normally: alt-tab, new tab, paste the dev URL, refresh after every edit, alt-tab back.

In the browser terminal, you open a URL pane inside the agent's chat surface. It's a real DOM iframe, clipped to the pane's rectangle, sitting beside the transcript. The agent edits hero.tsx, the dev server reloads, the pane shows the new hero. You type "the button is too small" without leaving the grid.

In a plain terminal the same pane degrades to a placeholder; the TUI is still a byte stream. In the browser it's a byte stream with a window in it.

You don't switch between the conversation and the result. The result is a pane in the conversation.