Mocking a new item into a live site's JS-animated list via Playwright

To preview a new element (e.g. a sponsor logo) inside a live site whose list items are positioned by a per-frame JS animation (inline translate/transform written on each registered item), cloning an existing <li> and appending it is not enough: the site's loop never updates the clone, so it sits at its initial offset while the originals move. Fix that works without touching the site: let the page settle after scrollIntoView (~3s), then at screenshot time copy the live inline style of a symmetric original onto the clone (negate the x translate and the rotate rad so it mirrors), and screenshot immediately. Setting the values with !important earlier does not help because the loop only moves originals and layout re-centering shifts everything. Use a data: URL for the clone's img src (and any CSS var like --stamp that the component reads) since mixed-content http://localhost images are blocked on https pages. Playwright Python with channel='chrome' works when no Playwright browsers are downloaded.