logan
ffc9490a32
`.expand` is the phone's only route into the full-screen now-playing view. It is absolutely positioned with `z-index: auto` over `.cover-art`, which is a *later* sibling with the same z-index, so the two tie on paint order and the later one wins. An `<img>` costs nothing there; a track with no artwork renders a placeholder `wa-icon`, which takes every click aimed at the button underneath it. So the control did not work whenever the current song had no cover, on the one platform that has no other way in. Nothing to do with the fixture: any library has untagged files. Measured at 390px with elementFromPoint at the button's centre — the icon with a placeholder, the button with an image, and the button either way with the z-index. Chosen over `pointer-events: none` on the art, which would take the cover preview's mouseenter with it, and over reordering the DOM, which leaves the same tie to be won by the same accident in the other direction. This was filed as an e2e flake, and the diagnosis was wrong: it failed on both engines three times across two branches that could not have caused it, and passed on re-run each time, because the spec starts the *first* row of the track list and which track that is depends on the order the scan inserted rows — the same root cause as #156. The new spec picks a track *for* having no artwork, and asserts the placeholder is rendered rather than assuming it, so it cannot quietly go back to measuring the easy case. Two things it has to get right, both already documented traps: the track must be the 90-second one, since a 2-second one finishes before the assertions run; and `library.Track.CoverArt` is empty for all 31 fixture rows, so "the first track with no cover art" selects nothing in particular and picked a short one. Verified by mutation: without the z-index the new spec fails on the click in 30s, and the pre-existing one beside it passes, which is exactly how this survived. Closes #150