Add Playwright E2E test suite (Phases 1-3)

.github/workflows/e2e.yml

@@ -0,0 +1,54 @@
+name: E2E Tests
+
+on:
+  push:
+    branches:
+      - master
+      - 'feature/**'
+  pull_request:
+
+jobs:
+  e2e:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+
+      - name: Install root deps
+        run: yarn install
+
+      - name: Build join-flow bundle (E2E mode)
+        working-directory: packages/join-flow
+        run: REACT_APP_USE_TEST_DATA=true npm run build
+
+      - name: Install E2E deps
+        working-directory: packages/join-e2e
+        run: npm ci
+
+      - name: Install Playwright browsers
+        working-directory: packages/join-e2e
+        run: npx playwright install --with-deps chromium
+
+      - name: Start wp-env
+        working-directory: packages/join-e2e
+        run: npx wp-env start
+
+      - name: Seed WordPress test environment
+        working-directory: packages/join-e2e
+        run: |
+          npx wp-env run tests-cli wp eval-file /var/www/html/wp-content/e2e-scripts/setup.php
+          npx wp-env run tests-cli wp rewrite flush --hard
+
+      - name: Run E2E tests
+        working-directory: packages/join-e2e
+        run: npm test -- --reporter=list,html
+
+      - uses: actions/upload-artifact@v4
+        if: failure()
+        with:
+          name: playwright-report
+          path: packages/join-e2e/playwright-report/

packages/join-e2e/.wp-env.json

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+{
+  "core": "WordPress/WordPress#6.5",
+  "plugins": ["../../packages/join-block"],
+  "mappings": {
+    "wp-content/e2e-scripts": "../../packages/join-e2e/scripts"
+  },
+  "config": {
+    "WP_DEBUG": true,
+    "WP_DEBUG_LOG": true,
+    "SCRIPT_DEBUG": true
+  }
+}