Add end-to-end tests for task modification and assignment features

- Implemented tests for editing penalty points and reward costs in `penalty-edit-points.spec.ts` and `reward-edit-cost.spec.ts`.
- Created detailed plans for task activation and assignment scenarios in `task-activated.plan.md` and `task-assignment.plan.md`.
- Added comprehensive test cases for modifying tasks, including editing points for chores, kindness acts, penalties, and rewards in `task-modified.plan.md`.
- Ensured all tests are isolated and run in serial mode to maintain state integrity.

frontend/vue-app/e2e/mode_parent/task-modification/chore-reset.spec.ts

@@ -0,0 +1,161 @@
+// spec: e2e/plans/task-modified.plan copy.md
+
+import { test, expect, type APIRequestContext, type Locator, type Page } from '@playwright/test'
+
+const CHILD_NAME = 'ModifyResetChild'
+const CHORE_NAME = 'ModifyResetChore'
+const CHORE_POINTS = 10
+const HELPER_KIND_NAME = 'ModifyResetKindnessHelper'
+
+async function createChild(request: APIRequestContext, name: string): Promise<string> {
+  const pre = await request.get('/api/child/list')
+  for (const c of (await pre.json()).children ?? []) {
+    if (c.name === name) await request.delete(`/api/child/${c.id}`)
+  }
+  await request.put('/api/child/add', { data: { name, age: 8 } })
+  const list = await request.get('/api/child/list')
+  const { children } = (await list.json()) as { children: { name: string; id: string }[] }
+  return children?.find((c) => c.name === name)?.id ?? ''
+}
+
+async function createTask(
+  request: APIRequestContext,
+  name: string,
+  type: 'chore' | 'kindness' | 'penalty',
+  points: number,
+): Promise<string> {
+  const pre = await request.get('/api/task/list')
+  for (const t of (await pre.json()).tasks ?? []) {
+    if (t.name === name) await request.delete(`/api/task/${t.id}`)
+  }
+  await request.put('/api/task/add', { data: { name, points, type } })
+  const list = await request.get('/api/task/list')
+  const { tasks } = (await list.json()) as { tasks: { name: string; id: string }[] }
+  return tasks?.find((t) => t.name === name)?.id ?? ''
+}
+
+async function activateItem(itemCard: Locator): Promise<void> {
+  await itemCard.click()
+  await expect(itemCard).toHaveClass(/item-ready/, { timeout: 3000 })
+  await itemCard.click()
+}
+
+function choreSection(page: Page): Locator {
+  return page.locator('.child-list-container').filter({
+    has: page.locator('h3', { hasText: 'Chores' }),
+  })
+}
+
+async function openChoreKebab(page: Page, card: Locator): Promise<void> {
+  await card.click()
+  await expect(card).toHaveClass(/item-ready/, { timeout: 3000 })
+  await expect(card.getByRole('button', { name: 'Options' })).toBeVisible()
+  await card.getByRole('button', { name: 'Options' }).click()
+}
+
+test.describe('Chore reset', () => {
+  test.describe.configure({ mode: 'serial' })
+
+  let childId = ''
+  let choreId = ''
+  let helperKindId = ''
+
+  test.beforeAll(async ({ request }) => {
+    childId = await createChild(request, CHILD_NAME)
+    choreId = await createTask(request, CHORE_NAME, 'chore', CHORE_POINTS)
+    helperKindId = await createTask(request, HELPER_KIND_NAME, 'kindness', 5)
+    await request.put(`/api/child/${childId}/set-tasks`, {
+      data: { task_ids: [choreId], type: 'chore' },
+    })
+    await request.put(`/api/child/${childId}/set-tasks`, {
+      data: { task_ids: [helperKindId], type: 'kindness' },
+    })
+  })
+
+  test.afterAll(async ({ request }) => {
+    if (childId) await request.delete(`/api/child/${childId}`)
+    if (choreId) await request.delete(`/api/task/${choreId}`)
+    if (helperKindId) await request.delete(`/api/task/${helperKindId}`)
+  })
+
+  test('"Reset" is absent from kebab menu when chore is not yet completed', async ({ page }) => {
+    await page.goto(`/parent/${childId}`)
+    const card = choreSection(page).locator('.item-card').filter({ hasText: CHORE_NAME })
+    await card.waitFor({ state: 'visible' })
+
+    await openChoreKebab(page, card)
+    await expect(page.getByRole('button', { name: 'Reset' })).not.toBeVisible()
+    await expect(page.getByRole('button', { name: 'Edit Points' })).toBeVisible()
+  })
+
+  test('Chore shows COMPLETED stamp after activation and confirmation', async ({ page }) => {
+    await page.goto(`/parent/${childId}`)
+    const card = choreSection(page).locator('.item-card').filter({ hasText: CHORE_NAME })
+    await card.waitFor({ state: 'visible' })
+
+    await activateItem(card)
+    await expect(page.getByRole('button', { name: 'Yes' })).toBeVisible()
+    await page.getByRole('button', { name: 'Yes' }).click()
+
+    await expect(card.getByText('COMPLETED')).toBeVisible()
+  })
+
+  test('"Reset" appears in kebab menu after chore is completed', async ({ page }) => {
+    await page.goto(`/parent/${childId}`)
+    const card = choreSection(page).locator('.item-card').filter({ hasText: CHORE_NAME })
+    await card.waitFor({ state: 'visible' })
+    await expect(card.getByText('COMPLETED')).toBeVisible()
+
+    await openChoreKebab(page, card)
+    await expect(page.getByRole('button', { name: 'Reset' })).toBeVisible()
+  })
+
+  test('Clicking "Reset" removes the COMPLETED stamp', async ({ page }) => {
+    await page.goto(`/parent/${childId}`)
+    const card = choreSection(page).locator('.item-card').filter({ hasText: CHORE_NAME })
+    await card.waitFor({ state: 'visible' })
+    await expect(card.getByText('COMPLETED')).toBeVisible()
+
+    await openChoreKebab(page, card)
+    await page.getByRole('button', { name: 'Reset' }).click()
+
+    await expect(card.getByText('COMPLETED')).not.toBeVisible()
+  })
+
+  test('Chore is re-activatable after reset — returns to COMPLETED on confirm', async ({
+    page,
+  }) => {
+    await page.goto(`/parent/${childId}`)
+    const card = choreSection(page).locator('.item-card').filter({ hasText: CHORE_NAME })
+    await card.waitFor({ state: 'visible' })
+
+    // Chore is not completed after the previous test's reset
+    await expect(card.getByText('COMPLETED')).not.toBeVisible()
+
+    await activateItem(card)
+    await expect(page.getByRole('button', { name: 'Yes' })).toBeVisible()
+    await page.getByRole('button', { name: 'Yes' }).click()
+
+    await expect(card.getByText('COMPLETED')).toBeVisible()
+  })
+
+  test('Reset → activate cycle is repeatable without error', async ({ page }) => {
+    await page.goto(`/parent/${childId}`)
+    const card = choreSection(page).locator('.item-card').filter({ hasText: CHORE_NAME })
+    await card.waitFor({ state: 'visible' })
+
+    // Reset the now-completed chore
+    await openChoreKebab(page, card)
+    await page.getByRole('button', { name: 'Reset' }).click()
+    await expect(card.getByText('COMPLETED')).not.toBeVisible()
+
+    // Navigate fresh so item-ready state is cleared before activating
+    await page.goto(`/parent/${childId}`)
+    await card.waitFor({ state: 'visible' })
+
+    // Activate again — COMPLETED returns
+    await activateItem(card)
+    await page.getByRole('button', { name: 'Yes' }).click()
+    await expect(card.getByText('COMPLETED')).toBeVisible()
+  })
+})