feat(portal-beheer): catalogus viewer loads published zaaktypen from the BFF (refs #130)

apps/beheer/src/app/catalogus/catalogus-page.ts

@@ -21,6 +21,25 @@ export class CatalogusPage {
   protected readonly failed = signal(false);
 
   constructor() {
-    // ponytail: stub for the red test; the real load lands in the green commit.
+    this.load();
+  }
+
+  load(): void {
+    this.loading.set(true);
+    this.failed.set(false);
+    this.bff.getBeheerCatalogiZaaktypen().subscribe({
+      next: (rows: BeheerZaaktype[]) => {
+        this.items.set(rows);
+        this.loading.set(false);
+        this.loaded.set(true);
+      },
+      // Surface the failure (e.g. 403 for a non-beheerder) instead of swallowing it.
+      error: () => {
+        this.items.set([]);
+        this.loading.set(false);
+        this.loaded.set(true);
+        this.failed.set(true);
+      },
+    });
   }
 }