`explore-album-details` was a fixed header over a scrolling tracklist, which is the desktop arrangement. At the reference device's 424x439 the header owned 253 of the panel's 318px and the list scrolled inside the 64 that were left, and the header's flex row squeezed `.album-info` to 112px beside a 200px cover -- so the title drew as one ellipsised glyph and two of the album's three primary actions were clipped by the component's own `overflow: hidden`: "Shuffle album" ended at x=443 in a 424px box, reachable by no gesture. Below 600px the host is the scroller and `.content` stops being one, so the header scrolls away and the page moves together; the header stacks art over info, so the info column has the row's whole width. The tracklist is plain DOM rather than a virtualizer, so nothing inside wants a scroll window of its own. Another `min-width: 0` was not the fix and the issue's own measurement says so: `.album-info` carries one and was shrinking as asked. Nor could `layout-overflow.spec.ts` see any of this -- `body.scrollWidth` equalled the viewport throughout, because the overflow was inside a component -- so the new spec measures each header control against the host's own box, which is `top-bar-fit.spec.ts`'s shape for the same reason. The phone block is last in the stylesheet on `index.css`'s rule: a media query adds no specificity, so above the rules it overrides every declaration in it would be silently dead. Closes #66