Add end-to-end tests for parent rewards management

- Implement tests for creating, editing, canceling, and deleting rewards in parent mode.
- Include scenarios for converting default rewards to user items and verifying restoration of default rewards after deletion.
- Create a comprehensive test plan outlining the steps and expectations for each scenario.

frontend/vue-app/e2e/mode_parent/create-child/happy-path.spec.ts

@@ -5,7 +5,7 @@ import path from 'path'
 import { fileURLToPath } from 'url'
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url))
-const TEST_IMAGE = path.join(__dirname, '../../../../../resources/logo/star_only.png')
+const TEST_IMAGE = path.join(__dirname, '../../.resources/crown.png')
 
 async function deleteNamedChildren(request: any, names: string[]) {
   const res = await request.get('/api/child/list')