test: update List.test.jsx and setup.js for improved test configurations

- Added export for ONE_DAY_IN_MILLISECONDS in List.test.jsx to mock time-related functionality.
- Updated setup.js to resolve CSS file conflict by mocking `calculateEstimate` from `@the-collab-lab/shopping-list-utils`.

tests/List.test.jsx

@@ -5,6 +5,7 @@ import { useStateWithStorage } from '../src/utils';
 
 vi.mock('../src/utils', () => ({
 	useStateWithStorage: vi.fn(),
+	ONE_DAY_IN_MILLISECONDS: 86400000,
 }));
 
 beforeEach(() => {

tests/setup.js

@@ -3,3 +3,8 @@
 // expect(element).toHaveTextContent(/react/i)
 // learn more: https://github.com/testing-library/jest-dom
 import '@testing-library/jest-dom/vitest';
+import { vi } from 'vitest';
+
+vi.mock('@the-collab-lab/shopping-list-utils', () => ({
+	calculateEstimate: vi.fn(),
+}));