Flaky playwright test: `Fixture "guestHomeserver" timeout of 30000ms exceeded during setup.`

https://github.com/element-hq/element-web/actions/runs/28382201256 (merge queue run, may be a false positive)

Start with the linked merge queue Actions run and the Playwright setup error for the `guestHomeserver` fixture. The payload names no source file or test path, so locate the fixture and inspect why setup exceeds 30000ms, then verify that the relevant test no longer flakes or times out.

Written by the indexing model from the issue text.