Two next-level player features (frontend-only):
1. Album-art ambient color — replaced the flat pixel AVERAGE (which muddied
every cover to grey-brown) with dominant-VIBRANT extraction: coarse
histogram binning weighted by saturation² × population, then a punch-up
pass (boost saturation ~1.3x, floor brightness) so the modal glow reads as
the cover's real standout color, Apple-Music style. Feeds the existing
--np-ambient-r/g/b hooks.
2. Drag-to-reorder queue — queue rows are now draggable; npReorderQueue moves
the item AND recomputes npQueueIndex so the currently-playing track stays
correctly tracked after a reorder. Accent drop-line indicator, grab cursor,
dragging opacity.
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