Add Axe accessibility E2E tests (#2)

Reviewed-on: #2

e2e/a11y/homePage.test.ts

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+import { expect, test } from '../fixtures'
+
+test('home page has no accessibility violations', async ({
+  a11y,
+  homePage,
+}) => {
+  await homePage.goTo()
+  await expect(homePage.articlesLocator).toHaveCount(0)
+
+  const result = await a11y().analyze()
+  expect(result.violations).toEqual([])
+})

e2e/a11y/listsPage.test.ts

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+import { expect, test } from '../fixtures'
+
+test('list picker has no accessibility violations', async ({
+  a11y,
+  listsPage,
+}) => {
+  await listsPage.goTo()
+  await expect(listsPage.articlesLocator).toHaveCount(0)
+
+  const result = await a11y().analyze()
+  expect(result.violations).toEqual([])
+})
+
+test('list timeline has no accessibility violations', async ({
+  a11y,
+  listsPage,
+}) => {
+  await listsPage.goTo()
+  await listsPage.openList(/My E2E List.*10 メンバー/)
+  await expect(listsPage.endOfFeedLocator).toBeVisible()
+
+  const result = await a11y().analyze()
+  expect(result.violations).toEqual([])
+})

e2e/a11y/searchPage.test.ts

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+import { expect, test } from '../fixtures'
+
+test('empty search page has no accessibility violations', async ({
+  a11y,
+  searchPage,
+}) => {
+  await searchPage.goTo()
+  await expect(searchPage.articlesLocator).toHaveCount(0)
+
+  const result = await a11y().analyze()
+  expect(result.violations).toEqual([])
+})
+
+test('search results have no accessibility violations', async ({
+  a11y,
+  searchPage,
+}) => {
+  await searchPage.goTo()
+  await searchPage.search('AI lang:ja')
+  await expect(searchPage.endOfFeedLocator).toBeVisible()
+
+  const result = await a11y().analyze()
+  expect(result.violations).toEqual([])
+})

e2e/a11y/threadPage.test.ts

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+import { expect, test } from '../fixtures'
+
+test('conversation has no accessibility violations', async ({
+  a11y,
+  threadPage,
+}) => {
+  await threadPage.goTo('yuta', '1001')
+  await expect(threadPage.endOfFeedLocator).toBeVisible()
+
+  const result = await a11y().analyze()
+  expect(result.violations).toEqual([])
+})

e2e/a11y/userPage.test.ts

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+import { expect, test } from '../fixtures'
+
+test('user timeline has no accessibility violations', async ({
+  a11y,
+  userPage,
+}) => {
+  await userPage.goTo('yuta')
+  await expect(userPage.endOfFeedLocator).toBeVisible()
+
+  const result = await a11y().analyze()
+  expect(result.violations).toEqual([])
+})