feat: add Playwright E2E tests to CI workflow for Next.js 16

- Add dedicated step to run Playwright E2E tests in CI
- Configure tests to run only for next-app-16-0-3 matrix entry
- Set PLAYWRIGHT_BASE_URL environment variable to localhost:3055

Author: JannikZed

.github/workflows/ci.yml

@@ -78,6 +78,12 @@ jobs:
           SKIP_BUILD: true
           NEXT_TEST_APP: ${{ matrix.next-test-app }}
 
+      - name: Run Playwright E2E tests (Next 16 only)
+        if: matrix.next-test-app == 'next-app-16-0-3'
+        run: pnpm test:e2e
+        env:
+          PLAYWRIGHT_BASE_URL: http://localhost:3055
+
       - name: Code Coverage Comments
         if: github.event_name == 'pull_request'
         uses: kcjpop/coverage-comments@v2.2