Refactor tests to use mockClient for database interactions, improve error handling, and enhance modal functionality

- Updated personalization.db.test.ts to use mockClient for query calls in addWatchedItem tests.
- Simplified error handling in shopping.db.test.ts, ensuring clearer error messages.
- Added comprehensive tests for VoiceAssistant component, including rendering and interaction tests.
- Introduced useModal hook with tests to manage modal state effectively.
- Created deals.db.test.ts to test deals repository functionality with mocked database interactions.
- Implemented error handling tests for custom error classes in errors.db.test.ts.
- Developed googleGeocodingService.server.test.ts to validate geocoding service behavior with mocked fetch.

src/routes/admin.system.routes.test.ts

@@ -9,7 +9,9 @@ import { errorHandler } from '../middleware/errorHandler';
 
 // Mock dependencies
 vi.mock('../services/geocodingService.server', () => ({
-  clearGeocodeCache: vi.fn(),
+  geocodingService: {
+    clearGeocodeCache: vi.fn(),
+  },
 }));
 
 // Mock other dependencies that are part of the adminRouter setup but not directly tested here
@@ -30,7 +32,7 @@ vi.mock('@bull-board/express', () => ({
 }));
 
 // Import the mocked modules to control them
-import { clearGeocodeCache } from '../services/geocodingService.server';
+import { geocodingService } from '../services/geocodingService.server';
 
 // Mock the logger
 vi.mock('../services/logger.server', () => ({
@@ -66,14 +68,14 @@ describe('Admin System Routes (/api/admin/system)', () => {
 
   describe('POST /system/clear-geocode-cache', () => {
     it('should return 200 on successful cache clear', async () => {
-      vi.mocked(clearGeocodeCache).mockResolvedValue(10);
+      vi.mocked(geocodingService.clearGeocodeCache).mockResolvedValue(10);
       const response = await supertest(app).post('/api/admin/system/clear-geocode-cache');
       expect(response.status).toBe(200);
       expect(response.body.message).toContain('10 keys were removed');
     });
 
     it('should return 500 if clearing the cache fails', async () => {
-      vi.mocked(clearGeocodeCache).mockRejectedValue(new Error('Redis is down'));
+      vi.mocked(geocodingService.clearGeocodeCache).mockRejectedValue(new Error('Redis is down'));
       const response = await supertest(app).post('/api/admin/system/clear-geocode-cache');
       expect(response.status).toBe(500);
       expect(response.body.message).toContain('Redis is down');