The automation create/edit modal footer laid the schedule/model dropdowns
and the Cancel/Create actions in a single justify-between row. On narrow
modals the fixed-width actions left too little room for the dropdowns,
which wrapped to two stacked lines with Cancel squeezed in the middle.
Stack the footer vertically on mobile (dropdowns row, then a right-aligned
actions row) and restore the horizontal layout at sm and up.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>