ui(vu): narrower 44deg swing, peak-based level, faster response; mini progress bar fix

- VU needle swings -22..+22deg instead of -45..+45 for a more realistic VU look
- Switch from RMS to peak frequency reading so the needle catches musical hits
- Faster attack (0.7) and release (0.25) so it swings rather than pinning
- Replace explicit grid lines with subtle repeating-conic-gradient ticks
- Scope mini progress bar styles to .mini-player; taller (3px), clickable

media_server/static/css/styles.css

@@ -5377,12 +5377,17 @@ body.visualizer-active .vinyl-stage .spectrogram-canvas {
 }
 #mini-current-time { color: var(--copper); font-weight: 500; }
 
-.mini-progress-bar {
-    height: 2px;
+.mini-player .mini-progress-bar {
+    flex: 0 0 auto;
+    height: 3px;
     background: var(--rule-strong);
     border-radius: 0;
+    cursor: pointer;
+    position: relative;
+    min-width: 0;
 }
-.mini-progress-fill {
+.mini-player .mini-progress-fill {
+    height: 100%;
     background: var(--copper);
     box-shadow: 0 0 8px var(--copper-glow);
     border-radius: 0;
@@ -7062,33 +7067,10 @@ body.audio-spectrum-live .now-playing .spectrum span {
     content: "";
     position: absolute;
     inset: 0;
-    /* 11 grid lines (every 9°) drawn ONLY in the needle's -45°..+45°
-       swing range. No mask — the conic-gradient is explicitly transparent
-       outside the 90° active wedge so the leftmost line aligns with the
-       needle's rest position (proper zero). */
-    background: conic-gradient(from 315deg at 50% 100%,
-        rgba(242, 235, 220, 0.18) 0deg 0.5deg,
-        transparent 0.5deg 9deg,
-        rgba(242, 235, 220, 0.18) 9deg 9.5deg,
-        transparent 9.5deg 18deg,
-        rgba(242, 235, 220, 0.18) 18deg 18.5deg,
-        transparent 18.5deg 27deg,
-        rgba(242, 235, 220, 0.18) 27deg 27.5deg,
-        transparent 27.5deg 36deg,
-        rgba(242, 235, 220, 0.18) 36deg 36.5deg,
-        transparent 36.5deg 45deg,
-        rgba(242, 235, 220, 0.25) 45deg 45.5deg,        /* slightly brighter centre line at 0 */
-        transparent 45.5deg 54deg,
-        rgba(242, 235, 220, 0.18) 54deg 54.5deg,
-        transparent 54.5deg 63deg,
-        rgba(242, 235, 220, 0.18) 63deg 63.5deg,
-        transparent 63.5deg 72deg,
-        rgba(242, 235, 220, 0.18) 72deg 72.5deg,
-        transparent 72.5deg 81deg,
-        rgba(242, 235, 220, 0.18) 81deg 81.5deg,
-        transparent 81.5deg 90deg,
-        rgba(242, 235, 220, 0.18) 90deg 90.5deg,
-        transparent 90.5deg 360deg);
+    background: repeating-conic-gradient(from 195deg at 50% 100%,
+        transparent 0deg 4deg,
+        rgba(242, 235, 220, 0.08) 4deg 5deg,
+        transparent 5deg 9deg);
 }
 .now-playing .vu-meter::after {
     content: "VU";
@@ -7109,8 +7091,7 @@ body.audio-spectrum-live .now-playing .spectrum span {
     height: 88%;
     background: linear-gradient(to top, var(--copper) 0%, var(--copper-hi) 70%, var(--ink) 100%);
     transform-origin: bottom center;
-    /* Rest at full-left like a real VU meter at silence (-∞ dB) */
-    transform: rotate(-45deg);
+    transform: rotate(-22deg);
     transition: transform 350ms var(--ease);
     box-shadow: 0 0 8px var(--copper-glow);
 }