Add artificial glow for iOS users

assets/css/radio.css

@@ -307,10 +307,25 @@ audio[controls] { width: 100%; outline: 0; }
   .history { width: min(96vw, 420px); }
 
   /* -webkit-touch-callout is a no-op everywhere except iOS WebKit, so this
-     @supports check hides the picker on iOS phones without any JS/UA sniffing. */
+     @supports check targets iOS phones without any JS/UA sniffing. Picker is
+     hidden there, so give the art a fake ambient glow (no audio analysis)
+     in its place. */
   @supports (-webkit-touch-callout: none) {
     .waveform-picker { display: none; }
+    .album-art { animation: art-glow-pulse 3.2s ease-in-out infinite; }
   }
 }
 
+@keyframes art-glow-pulse {
+  0%, 100% {
+    filter: drop-shadow(0 0 6px var(--accent)) drop-shadow(0 0 2px var(--accent));
+  }
+  50% {
+    filter: drop-shadow(0 0 42px var(--accent)) drop-shadow(0 0 15px var(--accent));
+  }
+}
+@media (prefers-reduced-motion: reduce) {
+  .album-art { animation: none; }
+}
+
 @media print { html, body { display: none; } }