Add end-to-end tests for parent item management

- Implement tests for creating, editing, and deleting chores, kindness acts, and penalties.
- Add tests to verify conversion of default items to user items and restoration of system defaults upon deletion.
- Ensure proper cancellation of creation and editing actions.
- Create a comprehensive plan document outlining the test scenarios and expected behaviors.

frontend/vue-app/playwright.config.ts

@@ -43,12 +43,16 @@ export default defineConfig({
       name: 'chromium',
       use: { ...devices['Desktop Chrome'], storageState: STORAGE_STATE },
       dependencies: ['setup'],
+      testIgnore: [/\/mode_child\//],
     },
 
     {
       name: 'chromium-no-pin',
       use: { ...devices['Desktop Chrome'], storageState: STORAGE_STATE_NO_PIN },
       dependencies: ['setup-no-pin'],
+      // never run the large task suite or the SSE cross‑tab tests when the parent
+      // pin is removed – they are slow and rely on long‑lived connections.
+      testIgnore: [/\/mode_parent\//],
     },
 
     // {