Add Playwright e2e suite for backend module, List module and ext:form

Adds an end-to-end test suite (modeled on hauptsacheNet/typo3-mcp-server) that
drives a real TYPO3 backend with Playwright and verifies the three user-facing
surfaces across TYPO3 12.4, 13.4 and 14.3:

- ext:form integration: the validated sender-address dropdown is injected into
  the form editor and the form can be saved
- the validation backend module lists sender addresses and revalidates them
- the List module lists and creates Mail Sender Address records

Build/runTests.sh sets up an SQLite-backed TYPO3 instance (seeded sender address
and form definition), serves it via the PHP built-in web server and runs the
Playwright specs in Build/tests/playwright/. It can pin a TYPO3 version with -t
and falls back to a host runner when Docker is unavailable. The Tests workflow
runs the e2e suite across all three supported versions.

https://claude.ai/code/session_01DaMNs9bAk3ofegnToxwF7X

Author: claude

.github/workflows/tests.yml

@@ -46,3 +46,50 @@ jobs:
 
       - name: Run functional test suite
         run: composer test
+
+  e2e-tests:
+    runs-on: ubuntu-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        typo3-version: ['12.4', '13.4', '14.3']
+
+    name: E2E TYPO3 ${{ matrix.typo3-version }}
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up PHP
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: '8.3'
+          extensions: sqlite3, pdo_sqlite, intl
+          coverage: none
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '22'
+          cache: 'npm'
+          cache-dependency-path: Build/package-lock.json
+
+      - name: Install Playwright (npm + browser with system deps)
+        working-directory: Build
+        run: |
+          npm ci
+          npx playwright install --with-deps chromium
+
+      - name: Run E2E test suite
+        run: bash Build/runTests.sh -s e2e -t ${{ matrix.typo3-version }} --no-docker
+
+      - name: Upload Playwright report
+        if: failure()
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-report-typo3-${{ matrix.typo3-version }}
+          path: |
+            Build/playwright-report
+            Build/test-results
+          retention-days: 7

Build/.gitignore

@@ -0,0 +1,4 @@
+# Playwright / Node artifacts
+/node_modules
+/playwright-report
+/test-results

Build/.nvmrc

@@ -0,0 +1 @@
+22

Build/package-lock.json

@@ -0,0 +1,15 @@
+{
+  "private": true,
+  "engines": {
+    "node": ">=22.18.0 <23.0.0"
+  },
+  "devDependencies": {
+    "@playwright/test": "1.52.0"
+  },
+  "scripts": {
+    "playwright:install": "playwright install",
+    "playwright:run": "playwright test",
+    "playwright:open": "playwright test --ui",
+    "playwright:report": "playwright show-report"
+  }
+}

Build/package.json

@@ -0,0 +1,38 @@
+import { defineConfig } from '@playwright/test';
+import config from './tests/playwright/config';
+
+export default defineConfig({
+  testDir: './tests/playwright',
+  timeout: 60000,
+  expect: { timeout: 15000 },
+  fullyParallel: false,
+  forbidOnly: !!process.env.CI,
+  retries: process.env.CI ? 2 : 0,
+  workers: 1,
+  reporter: [['list'], ['html', { outputFolder: './playwright-report', open: 'never' }]],
+  outputDir: './test-results',
+
+  use: {
+    baseURL: config.baseUrl,
+    ignoreHTTPSErrors: true,
+    viewport: { width: 1600, height: 1200 },
+    trace: 'on-first-retry',
+    screenshot: 'only-on-failure',
+    video: 'retain-on-failure',
+  },
+
+  projects: [
+    {
+      name: 'login setup',
+      testMatch: /helper\/login\.setup\.ts/,
+    },
+    {
+      name: 'e2e',
+      testMatch: /e2e\/.*\.spec\.ts/,
+      dependencies: ['login setup'],
+      use: {
+        storageState: './tests/playwright/.auth/login.json',
+      },
+    },
+  ],
+});