Density control reflow vs scale

One slider, two mechanisms. Reflow density rewrites the density tokens --card-min, --gap and type size, so grid-template-columns: repeat(auto-fill, minmax()) changes the column count. Scale only keeps the 100% layout and applies transform: scale(). Watch the library column count: it moves under reflow and stays frozen under scale. The first shelf also switches representation, grid to list rows, at Spacious under reflow. After Spotify.