Campaign drag reorder: fix sort in fetchDetails path

fetchDetails (db active path) sorted by createdAt, ignored order field.
Drag persisted but UI didn't re-sort. Now both paths sort by order
(fallback createdAt).

src/App.js

@@ -2377,8 +2377,12 @@ function AdminView({ userId }) {
           })
         );
 
-        // newest first by createdAt (fallback to name for stable order).
+        // sort by order field (fallback createdAt)
         detailedCampaigns.sort((a, b) => {
+          const ao = a.order ?? null, bo = b.order ?? null;
+          if (ao !== null && bo !== null) return ao - bo;
+          if (ao !== null) return -1;
+          if (bo !== null) return 1;
           const at = a.createdAt || 0;
           const bt = b.createdAt || 0;
           if (at === bt) return (a.name || '').localeCompare(b.name || '');