feat: enhance cart functionality with quantity update and removal features, integrating toast notifications for user feedback

src/app/core/layout/store-layout/store-layout.component.spec.ts

@@ -7,6 +7,7 @@ import { of } from 'rxjs';
 import { Tenant } from '../../services/tenant.interface';
 import { TenantService } from '../../services/tenant.service';
 import { CartService } from '../../services/cart/cart.service';
+import { ToastService } from '../../services/toast.service';
 import { StoreLayoutComponent } from './store-layout.component';
 
 const tenant: Tenant = {
@@ -45,7 +46,19 @@ describe('StoreLayoutComponent', () => {
           provide: CartService,
           useValue: {
             cart: signal(null).asReadonly(),
-            loadCart: () => of({ id: 1, items: [], subtotal: '0' })
+            loadCart: () => of({ id: 1, items: [], subtotal: '0' }),
+            updateItemQuantity: vi.fn().mockReturnValue(of({ data: { id: 1, items: [], subtotal: '0' } })),
+            removeItem: vi.fn().mockReturnValue(of({ data: { id: 1, items: [], subtotal: '0' } }))
+          }
+        },
+        {
+          provide: ToastService,
+          useValue: {
+            show: vi.fn(),
+            info: vi.fn(),
+            danger: vi.fn(),
+            success: vi.fn(),
+            dismiss: vi.fn()
           }
         }
       ]