Add WorkflowOptionalStepsDropdown — a controlled, portal-rendered multi-select
(listbox a11y, keyboard nav, committed 'Steps: N selected' label matrix,
render-nothing empty state) shared by the quick-add card and (next) the full
modal. Swap InlineCreateCard's inline chip toggles for it; the fetch/seed/submit
wiring is unchanged. Remove the now-unused chip CSS.
f08bf6af2e