Split from #10774. The list has no data-nav rows and no keys test. Give it j/k focus, Enter opening the row, Esc returning, ? help (all from the shared shell, no new JS), and a test that drives the real rendered page: focus marker, Enter, Esc, field guard. Some of these rows hold forms rather than links; decide per page and say what was left out.
Split from #10774. The list has no data-nav rows and no keys test. Give it j/k focus, Enter opening the row, Esc returning,
?help (all from the shared shell, no new JS), and a test that drives the real rendered page: focus marker, Enter, Esc, field guard. Some of these rows hold forms rather than links; decide per page and say what was left out.