Fix IAM user actions dropdown clipped by overflow-x-auto

The table wrapper's overflow-x-auto forced overflow-y to also clip,
hiding the 3-dot actions dropdown below the container boundary.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/admin/IAMPage.tsx

@@ -127,7 +127,7 @@ export default function IAMPage() {
           ) : !users?.length ? (
             <p className="px-5 pb-5 text-sm text-muted-foreground">No users found.</p>
           ) : (
-            <div className="overflow-x-auto">
+            <div>
               <table className="w-full text-sm">
                 <thead>
                   <tr className="border-b border-border bg-card-elevated/50">