bvandeusen
c466e6c317
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Operator-tunable 0-12s crossfade in Settings → Playback. Default 0 (off). Most albums sound best at 0 — gapless masters, classical, and live recordings all suffer noticeable crossfades. Implementation: pure-function position-derived volume scalar. `deriveFadeScalar(position, duration, crossfadeSec)` ramps from 0 to 1 over the leading X seconds, 1 to 0 over the trailing X seconds, and stays at 1 in between. Tracks shorter than 2X don't fade. The layout's audio-volume effect now multiplies player.volume by the fade scalar — no timers, no AudioContext, no element swapping. Re-renders at the ~4Hz `timeupdate` cadence give 16 discrete steps over a 4s fade, audibly close to smooth. Smoothing to per-frame ramps via rAF is a follow-up if needed. Setting persists to localStorage as `minstrel.crossfade` (matches the existing volume-storage convention). Tests cover the pure derivation (off, too-short track, fade-in, fade-out) + clamp/persist on setCrossfade + invalid-input recovery on readStoredCrossfade.