Add custom intervention modals

lib/create/methodCardSelectionOrder.ts

@@ -0,0 +1,12 @@
+/**
+ * Canonical ordering for method-card facet `selected*Ids` when the user adds a card:
+ * most recently confirmed id is index 0 so stack / compact layouts stay consistent
+ * with {@link orderRankedMethodsWithPinnedSelection}.
+ */
+export function moveFacetSelectionIdToFront(
+  prev: readonly string[],
+  id: string,
+): string[] {
+  const without = prev.filter((x) => x !== id);
+  return [id, ...without];
+}