fix(player): wire accent picker to editorial copper palette + visual polish

The accent picker only mutated --accent / --accent-hover, but the redesign
reads everything off --copper, --copper-hi, --copper-lo, --copper-glow.
--accent was a one-way alias of --copper, so picking a color did nothing.

Frontend (player.js):
- applyAccentColor now drives --copper, --copper-hi, --copper-lo, and a
  new --copper-rgb triplet (used by every soft tint / glow on both themes)
- darkenColor / hexToRgbTriple helpers added beside lightenColor

CSS (styles.css):
- introduce --copper-rgb tokens for both themes; --copper-glow now derives
  from rgba(var(--copper-rgb), 0.35) so it follows the picker
- replace 21 hardcoded rgba(224,128,56,...) / rgba(31,78,61,...) literals
  across hover bgs, focus halos, glows, vinyl-label gradients with
  rgba(var(--copper-rgb), ...)
- replace the light-theme vinyl-label gradient hexes with
  var(--copper) / var(--copper-lo)

Other player polish in this changeset:
- track-masthead: padding-right clamp(12px, 1.5vw, 24px) so VU meter,
  spectrum tail, end timecode and controls sit inset from the panel edge
  (zeroed on the single-column mobile breakpoint to keep symmetry)
- VU meter 140→120 px, volume slider 80→64 px to free up row width so
  the cluster stays inline with prev/play/next instead of wrapping
- light-theme VU meter override: cream gauge face, dark-ink scale ticks,
  hunter-emerald needle (replaces the hardcoded black gauge)
- fullscreen meta-cell labels: var(--ink-faint) → var(--copper) so STATE
  and SOURCE read as part of the same editorial system as the kicker

media_server/static/css/styles.css

@@ -113,7 +113,8 @@
     --copper:        #E08038;
     --copper-hi:     #F4A064;
     --copper-lo:     #B0561F;
-    --copper-glow:   rgba(224, 128, 56, 0.35);
+    --copper-rgb:    224, 128, 56;
+    --copper-glow:   rgba(var(--copper-rgb), 0.35);
 
     --amber:         #F5C26B;
     --jade:          #7AB294;
@@ -167,7 +168,8 @@
     --copper:        #1F4E3D;       /* hunter emerald in light mode */
     --copper-hi:     #2D6A53;
     --copper-lo:     #143E2F;
-    --copper-glow:   rgba(31, 78, 61, 0.18);
+    --copper-rgb:    31, 78, 61;
+    --copper-glow:   rgba(var(--copper-rgb), 0.18);
 
     --amber:         #C29D31;
     --jade:          #4D8C6F;
@@ -4751,7 +4753,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
     justify-content: center;
 }
 :root[data-theme="light"] .vinyl-stage .vinyl-wrap .vinyl-label {
-    background: linear-gradient(135deg, #1F4E3D 0%, #143E2F 100%);
+    background: linear-gradient(135deg, var(--copper) 0%, var(--copper-lo) 100%);
     box-shadow:
         inset 0 0 18px rgba(0, 0, 0, 0.4),
         inset 0 1px 0 rgba(255, 255, 255, 0.06),
@@ -4946,7 +4948,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
     border: 1px solid var(--rule-strong);
     border-radius: 4px 4px 0 0;
     overflow: hidden;
-    box-shadow: inset 0 2px 6px rgba(0,0,0,0.5), inset 0 0 30px rgba(224,128,56,0.08);
+    box-shadow: inset 0 2px 6px rgba(0,0,0,0.5), inset 0 0 30px rgba(var(--copper-rgb), 0.08);
 }
 .vu-meter::before {
     content: "";
@@ -5128,7 +5130,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
     height: 10px;
     background: var(--copper);
     border-radius: 50%;
-    box-shadow: 0 0 14px var(--copper-glow), 0 0 0 4px rgba(224, 128, 56, 0.12);
+    box-shadow: 0 0 14px var(--copper-glow), 0 0 0 4px rgba(var(--copper-rgb), 0.12);
     transition: none;
 }
 
@@ -5169,7 +5171,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
     transition: all 220ms var(--ease);
 }
 .controls button:hover {
-    background: rgba(224, 128, 56, 0.06);
+    background: rgba(var(--copper-rgb), 0.06);
     border-color: var(--copper);
     color: var(--copper);
 }
@@ -5213,7 +5215,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
 .mute-btn:hover {
     border-color: var(--copper);
     color: var(--copper);
-    background: rgba(224, 128, 56, 0.06);
+    background: rgba(var(--copper-rgb), 0.06);
 }
 
 #volume-slider {
@@ -5232,7 +5234,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
     height: 14px;
     background: var(--copper);
     border-radius: 50%;
-    box-shadow: 0 0 12px var(--copper-glow), 0 0 0 4px rgba(224, 128, 56, 0.12);
+    box-shadow: 0 0 12px var(--copper-glow), 0 0 0 4px rgba(var(--copper-rgb), 0.12);
     border: 0;
     cursor: grab;
 }
@@ -5297,7 +5299,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
 .vinyl-toggle-btn.active {
     border-color: var(--copper);
     color: var(--copper);
-    background: rgba(224, 128, 56, 0.06);
+    background: rgba(var(--copper-rgb), 0.06);
 }
 
 /* ═══════════════════════════════════════════════════════════════
@@ -5581,7 +5583,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
 .view-toggle-btn:last-child { border-right: 0; }
 .view-toggle-btn:hover {
     color: var(--copper);
-    background: rgba(224, 128, 56, 0.04);
+    background: rgba(var(--copper-rgb), 0.04);
 }
 .view-toggle-btn.active {
     background: var(--ink);
@@ -5987,7 +5989,7 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
     border-color: var(--copper);
     border-style: solid;
     color: var(--copper);
-    background: rgba(224, 128, 56, 0.04);
+    background: rgba(var(--copper-rgb), 0.04);
 }
 .add-card-icon {
     font-family: var(--serif);
@@ -6356,7 +6358,7 @@ dialog::backdrop {
     font-size: 10px;
 }
 .icon-select-cell:hover {
-    background: rgba(224, 128, 56, 0.06);
+    background: rgba(var(--copper-rgb), 0.06);
     color: var(--copper);
 }
 
@@ -6848,7 +6850,7 @@ body.audio-spectrum-live .now-playing .spectrum span {
     width: 10px; height: 10px;
     background: var(--copper);
     border-radius: 50%;
-    box-shadow: 0 0 14px var(--copper-glow), 0 0 0 4px rgba(224, 128, 56, 0.12);
+    box-shadow: 0 0 14px var(--copper-glow), 0 0 0 4px rgba(var(--copper-rgb), 0.12);
     transition: none;
 }
 
@@ -6879,7 +6881,7 @@ body.audio-spectrum-live .now-playing .spectrum span {
 .now-playing .btn-trans:hover {
     border-color: var(--copper);
     color: var(--copper);
-    background: rgba(224, 128, 56, 0.06);
+    background: rgba(var(--copper-rgb), 0.06);
 }
 .now-playing .btn-trans:disabled {
     opacity: 0.35;
@@ -6955,7 +6957,7 @@ body.audio-spectrum-live .now-playing .spectrum span {
 .now-playing .vu-volume .mute-btn:hover {
     border-color: var(--copper);
     color: var(--copper);
-    background: rgba(224, 128, 56, 0.06);
+    background: rgba(var(--copper-rgb), 0.06);
 }
 .now-playing .vu-volume .mute-btn svg {
     width: 14px;
@@ -7007,7 +7009,7 @@ body.audio-spectrum-live .now-playing .spectrum span {
     border: 1px solid var(--rule-strong);
     border-radius: 4px 4px 0 0;
     overflow: hidden;
-    box-shadow: inset 0 2px 6px rgba(0,0,0,0.5), inset 0 0 30px rgba(224,128,56,0.08);
+    box-shadow: inset 0 2px 6px rgba(0,0,0,0.5), inset 0 0 30px rgba(var(--copper-rgb), 0.08);
     flex-shrink: 0;
 }
 .now-playing .vu-meter::before {
@@ -7066,7 +7068,7 @@ body.audio-spectrum-live .now-playing .spectrum span {
     border-color: var(--rule-strong);
     box-shadow:
         inset 0 1px 2px rgba(26, 23, 21, 0.08),
-        inset 0 0 24px rgba(31, 78, 61, 0.05);
+        inset 0 0 24px rgba(var(--copper-rgb), 0.05);
 }
 :root[data-theme="light"] .now-playing .vu-meter::before {
     background: repeating-conic-gradient(from 195deg at 50% 100%,
@@ -7079,7 +7081,7 @@ body.audio-spectrum-live .now-playing .spectrum span {
 }
 :root[data-theme="light"] .now-playing .vu-needle {
     background: linear-gradient(to top, var(--copper) 0%, var(--copper-lo) 70%, var(--ink) 100%);
-    box-shadow: 0 0 6px rgba(31, 78, 61, 0.25);
+    box-shadow: 0 0 6px rgba(var(--copper-rgb), 0.25);
 }
 
 /* Mobile VU cluster: stack below controls */
@@ -7233,7 +7235,7 @@ body.audio-spectrum-live .now-playing .spectrum span {
 .browser-container .browser-refresh-btn:hover,
 .browser-container .browser-play-all-btn:hover {
     color: var(--copper) !important;
-    background: rgba(224, 128, 56, 0.06) !important;
+    background: rgba(var(--copper-rgb), 0.06) !important;
 }
 .browser-container .view-toggle-btn.active {
     background: var(--ink) !important;
@@ -7752,7 +7754,7 @@ select option {
     border-color: var(--copper) !important;
     border-style: solid !important;
     color: var(--copper) !important;
-    background: rgba(224, 128, 56, 0.04) !important;
+    background: rgba(var(--copper-rgb), 0.04) !important;
 }
 .settings-container .add-card-icon {
     font-family: var(--serif);
@@ -7987,7 +7989,7 @@ select option {
 .display-container .display-power-btn:hover {
     color: var(--copper) !important;
     border-color: var(--copper) !important;
-    background: rgba(224, 128, 56, 0.06) !important;
+    background: rgba(var(--copper-rgb), 0.06) !important;
 }
 
 /* Brightness control row */
@@ -8138,7 +8140,7 @@ select option {
     font-size: 10px;
 }
 .icon-select-cell:hover {
-    background: rgba(224, 128, 56, 0.06) !important;
+    background: rgba(var(--copper-rgb), 0.06) !important;
     color: var(--copper) !important;
 }
 
@@ -8396,7 +8398,7 @@ select option {
     }
     .mini-control-btn:hover {
         border-color: var(--copper) !important;
-        background: rgba(224, 128, 56, 0.08) !important;
+        background: rgba(var(--copper-rgb), 0.08) !important;
         color: var(--copper) !important;
     }
     .mini-control-btn svg {
@@ -8768,7 +8770,7 @@ body.is-fullscreen-player .player-container {
     margin: 0;
     padding: 0;
     background:
-        radial-gradient(ellipse at 30% 35%, rgba(224, 128, 56, 0.05) 0%, transparent 55%),
+        radial-gradient(ellipse at 30% 35%, rgba(var(--copper-rgb), 0.05) 0%, transparent 55%),
         radial-gradient(ellipse at center, var(--bg-paper) 0%, var(--bg-deep) 75%);
     display: grid;
     place-items: stretch;
@@ -9069,7 +9071,7 @@ body.is-fullscreen-player .now-playing .meta-cell .label {
     font-family: var(--mono);
     font-size: 9px;
     letter-spacing: 0.32em;
-    color: var(--ink-faint);
+    color: var(--copper);
 }
 body.is-fullscreen-player .now-playing .meta-cell .value {
     font-family: var(--mono);

media_server/static/js/player.js

@@ -145,6 +145,22 @@ export function lightenColor(hex, percent) {
     return `#${((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1)}`;
 }
 
+function darkenColor(hex, percent) {
+    const num = parseInt(hex.replace('#', ''), 16);
+    const r = Math.max(0, (num >> 16) - Math.round(255 * percent / 100));
+    const g = Math.max(0, ((num >> 8) & 0xff) - Math.round(255 * percent / 100));
+    const b = Math.max(0, (num & 0xff) - Math.round(255 * percent / 100));
+    return `#${((1 << 24) + (r << 16) + (g << 8) + b).toString(16).slice(1)}`;
+}
+
+function hexToRgbTriple(hex) {
+    const num = parseInt(hex.replace('#', ''), 16);
+    const r = (num >> 16) & 0xff;
+    const g = (num >> 8) & 0xff;
+    const b = num & 0xff;
+    return `${r}, ${g}, ${b}`;
+}
+
 export function initAccentColor() {
     const saved = localStorage.getItem('accentColor');
     if (saved) {
@@ -159,8 +175,18 @@ export function initAccentColor() {
 }
 
 export function applyAccentColor(color, hover) {
-    document.documentElement.style.setProperty('--accent', color);
+    const root = document.documentElement.style;
-    document.documentElement.style.setProperty('--accent-hover', hover);
+    root.setProperty('--accent', color);
+    root.setProperty('--accent-hover', hover);
+    // Editorial palette tokens — the redesign reads these directly,
+    // so the picker must drive them too (the --accent alias alone has
+    // no effect once components moved off it).
+    root.setProperty('--copper', color);
+    root.setProperty('--copper-hi', hover);
+    root.setProperty('--copper-lo', darkenColor(color, 12));
+    root.setProperty('--copper-rgb', hexToRgbTriple(color));
+    // --copper-glow inherits the rgba(var(--copper-rgb), 0.35) formula
+    // declared in styles.css, so it picks up the new RGB automatically.
     localStorage.setItem('accentColor', color);
     const dot = document.getElementById('accentDot');
     if (dot) dot.style.background = color;