fix(gro-558): add paginated mock for /api/invoices (#261)

fix(e2e): add paginated mock for /api/invoices in navigation.spec.ts

Fixes GRO-557. The generic E2E API mock returned [] for /api/invoices, but the InvoicesPage component expects { data: [], total: 0 }. This crashed React and prevented the page from rendering, causing the admin invoices test to fail consistently.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/e2e/tests/navigation.spec.ts

@@ -44,7 +44,10 @@ test.beforeEach(async ({ page }) => {
         json: { newClients: [], activeInPeriodCount: 0, churnRisk: [], churnRiskTotal: 0 },
       });
     }
-    // Appointments, clients, services, staff, invoices, book, etc.
+    if (url.includes("/api/invoices")) {
+      return route.fulfill({ json: { data: [], total: 0 } });
+    }
+    // Appointments, clients, services, staff, book, etc.
     return route.fulfill({ json: [] });
   });
 });