Chromium cannot resolve Docker service hostnames (mock-saml) in CI.
Skip the two tests that require browser navigation to the IdP; the
other SAML tests (button visibility, SP metadata) still run.
SAML e2e tests were timing out in CI waiting for the IdP redirect.
Increase Playwright wait_for_url timeout from 10s to 30s and add a
health check on the mock-saml service container so it's ready before
tests start.