chore: import DH V2 D5.6.4 production baseline

web-v2/src/auth/PermissionGate.tsx

@@ -0,0 +1,14 @@
+import type { ReactNode } from 'react';
+import { useAuth } from './AuthContext';
+
+export function PermissionGate({
+  permission,
+  children,
+  fallback = null,
+}: {
+  permission: string;
+  children: ReactNode;
+  fallback?: ReactNode;
+}) {
+  return useAuth().hasPermission(permission) ? children : fallback;
+}