Hide waveform selector in iOS

assets/css/radio.css

@@ -305,6 +305,12 @@ audio[controls] { width: 100%; outline: 0; }
   .player-card { padding: 16px; }
   .art-wrap, .album-art { width: 96%; }
   .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 (-webkit-touch-callout: none) {
+    .waveform-picker { display: none; }
+  }
 }
 
 @media print { html, body { display: none; } }