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a11y.22, WCAG 1.4.1: `.track-row.active` was a background tint and a text colour, and the row markup carried no aria-current either — so a colour-blind user could not find the playing row and AT had no signal at all. The queue panel had aria-current from Phase 1 and the same colour-only visual. A triangle drawn in each row's own left padding by `::before`. It is a shape that is present or absent, and it costs no layout: track-list's grid columns are computed from the host width, so a marker in the flow would move every cell on the playing row and nothing else. Both directions are asserted in both tiers. A marker that renders on every row satisfies "the playing row has one" for free, which is this plan's oldest rule. And one thing the reproduction found: a track started from the *list* leaves the queue's currentIndex at -1, so the panel has no current row in that flow at all. Pre-existing, and the reason this looked broken the first time it was checked in the running app.