TudorandClaude Opus 5
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Two things here cannot be covered anywhere else. jsdom has no layout, so scrollWidth and clientWidth are both 0 and the arrows' disabled state can only be measured by a real engine. And the scroll position surviving a selection is DOM state rather than React state, so only a real browser can prove the row does not jump back when the footer re-renders. MOBILE.md asks for a Playwright width check and records that it was not written because Playwright was not in the project. It is — this suite — so the check exists now, scoped to the page this feature touches. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>