Dashboard voicings rail: guitar galleries capped to 4 shapes
(recommended-first, then open, then movable by base fret; prop-gated so
the Knowledge Center and chord modal keep all shapes); piano voicings
render as a 2x2 grid of size="mini" (scale 0.60) keyboards under the
rail's dense path only. Play buttons removed globally from
VoicingBrowser per the user ("leave them off, better not") — the
Knowledge Center + modal render byte-identical minus the buttons.
A scoped .dark-scroll utility (thin, #2a2a2a on transparent) dresses
the dashboard scrollers. Critic PASS (combined gate: byte-identity
proven, zero play buttons everywhere, contract intact).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>