The stacked split nested two scroll wells (list and detail each carried
max-height + overflow-y auto) inside the page scroll - scrollbars within
scrollbars on small screens. At <=900px both panes now flow naturally in
the one page scroll, and selecting an application swaps the list out for
the detail pane with a Back to list button (standard master-detail
collapse); selection also scrolls to the top so the detail header is in
view. Desktop keeps the two-pane split unchanged.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>