fix: run E2E tests properly with mounted browsers and real postgres

- Mount /opt/playwright-tools/browsers into web container (docker-compose.yml
  and CI docker run) — never download browsers, use the ones on this host
- Set PLAYWRIGHT_BROWSERS_PATH in all container envs (compose + CI)
- Drop 'playwright install chromium' steps from pr-e2e and nightly-e2e jobs
- Bump playwright requirement to ~1.57.0 to match the installed browser builds
- Fix seed_e2e_content: de-duplicate default Site entries left by unit test
  fixtures so Wagtail always routes to the seeded home page
- Fix test_comments_section_absent_when_disabled: use exact=True on heading
  locator to avoid matching 'No Comments Article' h1 as 'Comments' heading
- Fix test_copy_link_button_updates_text: use [data-copy-link] data-attr
  locator (stable across text change) and force-override clipboard.writeText
  via page.evaluate() rather than relying on init_script polyfill

E2E suite verified locally: 34 passed via docker compose exec

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.gitea/workflows/ci.yml

@@ -97,12 +97,14 @@ jobs:
       - name: Start app with seeded content
         run: |
           docker run -d --name pr-e2e-app --network container:pr-e2e-postgres \
+            -v /opt/playwright-tools/browsers:/opt/playwright-tools/browsers:ro \
             -e SECRET_KEY=ci-secret-key \
             -e DATABASE_URL=postgres://nohype:nohype@127.0.0.1:5432/nohype \
             -e CONSENT_POLICY_VERSION=1 \
             -e EMAIL_BACKEND=django.core.mail.backends.console.EmailBackend \
             -e DEFAULT_FROM_EMAIL=hello@nohypeai.com \
             -e NEWSLETTER_PROVIDER=buttondown \
+            -e PLAYWRIGHT_BROWSERS_PATH=/opt/playwright-tools/browsers \
             "$CI_IMAGE" \
             sh -lc "python manage.py migrate --noinput && python manage.py seed_e2e_content && python manage.py runserver 0.0.0.0:8000"
           for i in $(seq 1 40); do
@@ -114,9 +116,6 @@ jobs:
           docker logs pr-e2e-app || true
           exit 1
 
-      - name: Install Playwright browsers
-        run: docker exec pr-e2e-app python -m playwright install chromium
-
       - name: Run E2E tests
         run: |
           docker exec -e E2E_BASE_URL=http://127.0.0.1:8000 pr-e2e-app \
@@ -159,12 +158,14 @@ jobs:
       - name: Start dev server with seeded content
         run: |
           docker run -d --name nightly-e2e --network container:nightly-postgres \
+            -v /opt/playwright-tools/browsers:/opt/playwright-tools/browsers:ro \
             -e SECRET_KEY=ci-secret-key \
             -e DATABASE_URL=postgres://nohype:nohype@127.0.0.1:5432/nohype \
             -e CONSENT_POLICY_VERSION=1 \
             -e EMAIL_BACKEND=django.core.mail.backends.console.EmailBackend \
             -e DEFAULT_FROM_EMAIL=hello@nohypeai.com \
             -e NEWSLETTER_PROVIDER=buttondown \
+            -e PLAYWRIGHT_BROWSERS_PATH=/opt/playwright-tools/browsers \
             "$CI_IMAGE" \
             sh -lc "python manage.py migrate --noinput && python manage.py seed_e2e_content && python manage.py runserver 0.0.0.0:8000"
           for i in $(seq 1 40); do
@@ -177,7 +178,6 @@ jobs:
           exit 1
       - name: Run Playwright E2E tests
         run: |
-          docker exec nightly-e2e python -m playwright install chromium
           docker exec -e E2E_BASE_URL=http://127.0.0.1:8000 nightly-e2e \
             pytest e2e/ apps/core/tests/test_nightly_e2e_playwright.py -o addopts='' -q --tb=short
       - name: Remove nightly container