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/rewards/reward-cancel.spec.ts

@@ -0,0 +1,77 @@
+// spec: frontend/vue-app/e2e/plans/parent-rewards-management.plan.md
+// seed: e2e/seed.spec.ts
+
+import { test, expect } from '@playwright/test'
+
+test.describe('Reward cancellation', () => {
+  test.beforeEach(async ({ page }, testInfo) => {
+    test.skip(testInfo.project.name === 'chromium-no-pin', 'Requires parent-authenticated mode')
+  })
+
+  test.describe.configure({ mode: 'serial' })
+
+  test('Cancel reward creation', async ({ page }) => {
+    // 1. Navigate and open create form
+    await page.goto('/parent/rewards')
+    await page.getByRole('button', { name: 'Create Reward' }).click()
+    await expect(page.locator('text=Reward Name')).toBeVisible()
+
+    // 2. Fill then cancel
+    await page.evaluate(() => {
+      const setVal = (sel: string, val: string) => {
+        const el = document.querySelector(sel) as HTMLInputElement | null
+        if (el) {
+          el.value = val
+          el.dispatchEvent(new Event('input', { bubbles: true }))
+          el.dispatchEvent(new Event('change', { bubbles: true }))
+        }
+      }
+      setVal('#name', 'Test')
+      setVal('#cost', '5')
+    })
+    await page.getByRole('button', { name: 'Cancel' }).click()
+
+    // verify return to list and no "Test" item
+    await expect(page.getByText('Test')).toHaveCount(0)
+  })
+
+  test('Cancel reward edit', async ({ page }) => {
+    // 1. Ensure Toy car exists and open edit
+    const suffix = Date.now()
+    const original = `Toy car ${suffix}`
+    await page.goto('/parent/rewards')
+    if (!(await page.locator(`text=${original}`).count())) {
+      await page.getByRole('button', { name: 'Create Reward' }).click()
+      await page.evaluate((name) => {
+        const setVal = (sel: string, val: string) => {
+          const el = document.querySelector(sel) as HTMLInputElement | null
+          if (el) {
+            el.value = val
+            el.dispatchEvent(new Event('input', { bubbles: true }))
+            el.dispatchEvent(new Event('change', { bubbles: true }))
+          }
+        }
+        setVal('#name', name)
+        setVal('#cost', '20')
+      }, original)
+      await page.getByRole('button', { name: 'Create' }).click()
+    }
+    await expect(page.locator(`text=${original}`)).toBeVisible()
+    await page.click(`text=${original}`)
+    await expect(page.locator('text=Reward Name')).toBeVisible()
+
+    // 2. make a change then cancel
+    await page.evaluate(() => {
+      const el = document.querySelector('#name') as HTMLInputElement | null
+      if (el) {
+        el.value = 'Should not save'
+        el.dispatchEvent(new Event('input', { bubbles: true }))
+        el.dispatchEvent(new Event('change', { bubbles: true }))
+      }
+    })
+    await page.getByRole('button', { name: 'Cancel' }).click()
+
+    await expect(page.locator('text=Should not save')).toHaveCount(0)
+    await expect(page.locator(`text=${original}`)).toBeVisible()
+  })
+})