frontend-app-api: apply review follow-up cleanup

Tighten a few small follow-up details from review by improving stack traces in permission batching, simplifying synthetic child refs, and making predicate traversal narrowing more direct.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

plugins/permission-react/src/apis/IdentityPermissionApi.ts

@@ -67,6 +67,6 @@ export class IdentityPermissionApi implements PermissionApi {
   async authorize(
     request: AuthorizePermissionRequest,
   ): Promise<AuthorizePermissionResponse> {
-    return this.loader.load(request);
+    return await this.loader.load(request);
   }
 }