Fix store item variant defaults and listing sorting

Auto-select first option in variation modals and sort store items by availability, then update time.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/business/src/components/EditStoreItemsModal.tsx

@@ -83,6 +83,32 @@ export function EditStoreItemsModal({
     [variations],
   )
 
+  // When modal loads, ensure each variation select has a valid default selection.
+  // This fixes cases where existing store-item variants don't return selections for all variations.
+  useEffect(() => {
+    if (!mounted || closing) return
+    if (formVariations.length === 0) return
+
+    setRows((prev) => {
+      let changed = false
+      const next = prev.map((row) => {
+        const nextSelections = { ...row.selections }
+        for (const variation of formVariations) {
+          const current = nextSelections[variation.id]
+          if (current) continue
+          const options = getVariationOptions(variation)
+          const first = options[0]
+          if (first?.id) {
+            nextSelections[variation.id] = first.id
+            changed = true
+          }
+        }
+        return changed ? { ...row, selections: nextSelections } : row
+      })
+      return changed ? next : prev
+    })
+  }, [formVariations, mounted, closing])
+
   const gridTemplate = useMemo(() => {
     const variationCols = formVariations.map(() => 'minmax(110px, 1fr)').join(' ')
     const cols = [variationCols, 'minmax(120px, 1fr)', '90px', '72px', '32px']