Generating an app is only half the value — seeing it run is the other half. The scaffold experience got a proper preview surface:
- Preview from the Files pane — generated projects can be opened and rendered directly from the room's Files pane, not just inline in the chat.
- Viewport toggle + full-screen — a device-preset toggle lets you check the result at phone, tablet, and desktop widths, and a full-screen mode gives the preview the whole window. The fullscreen view centers correctly and the long-standing hover flicker on the preview frame was eliminated.
- Per-file preview — individual files in a scaffold can be previewed on their own.
- Code that wraps — generated code blocks now wrap to the column width instead of forcing a horizontal scrollbar, and each scaffold card got a Reply button that stages a reply to it in the composer.
Several layout bugs were cleaned up along the way: the Preview button no longer clips inside the narrow sidebar pane, and the scaffold Preview modal now renders above the neuron-graph overlay instead of behind it.
Why it matters
The point of generating an app is to look at it. Bringing the preview into the Files pane, giving it real device widths and a full-screen mode, and killing the flicker and clipping turns a neat trick into a usable build-and-review loop.