The per-file comparison tab becomes a `changes-review` tab per turn: a file selector in the header lists every recorded file, a card row opens the tab on its file through a navigation parameter, and the header's tools switch between the unified and a side-by-side view, switch line wrapping, open the whole file in the Sidebar, and open it in the default application when a desktop exists. View and wrap choices are kept per tab in an exclusive store.