/lebensuhr, /3x3-system, and /7-tage-klarheits-check each defined
their own local copies of the same hand-drawn brand-line icons.
Moved them into app/components/icons/StepIcons.tsx as a keyed
registry (STEP_ICONS) — also what the new Payload Pages collection's
StepRowBlock select field maps onto by key, so a page-builder step
row can reference these same icons without duplicating SVG paths a
third time.
Marco