more unit test fixes + some integration

src/services/aiApiClient.test.ts

@@ -6,7 +6,7 @@ import { http, HttpResponse } from 'msw';
 // Ensure the module under test is NOT mocked.
 vi.unmock('./aiApiClient');
 
-import { createMockFlyerItem, createMockStore } from '../tests/utils/mockFactories';
+import { createMockFlyerItem, createMockStore, createMockMasterGroceryItem } from '../tests/utils/mockFactories';
 import * as aiApiClient from './aiApiClient';
 
 // 1. Mock logger to keep output clean
@@ -387,4 +387,17 @@ describe('AI API Client (Network Mocking with MSW)', () => {
       );
     });
   });
+
+  describe('compareWatchedItemPrices', () => {
+    it('should send items as JSON in the body', async () => {
+      const items = [createMockMasterGroceryItem({ name: 'apple' })];
+      await aiApiClient.compareWatchedItemPrices(items);
+
+      expect(requestSpy).toHaveBeenCalledTimes(1);
+      const req = requestSpy.mock.calls[0][0];
+
+      expect(req.endpoint).toBe('compare-prices');
+      expect(req.body).toEqual({ items });
+    });
+  });
 });