Center and pad indexing page to match other pages

apps/web/src/app/indexing/page.tsx

@@ -177,7 +177,8 @@ export default function IndexManagementPage() {
   };
 
   return (
-    <div className="space-y-6">
+    <div className="max-w-7xl mx-auto px-6 py-8 lg:px-8">
+      <div className="space-y-6">
       <div>
         <h1 className="text-2xl font-bold text-gray-900 dark:text-gray-100">
           Index Management