Add ability to copy lyric text

assets/css/radio.css

@@ -232,6 +232,7 @@ audio[controls] { width: 100%; outline: 0; }
   background: none; border: none; margin: 0; padding: 4px 0;
   font: inherit; color: inherit; cursor: pointer;
   opacity: .55; transition: opacity .2s ease, color .2s ease;
+  -webkit-user-select: text; user-select: text;   /* buttons are unselectable by default */
 }
 .lyrics-line:hover, .lyrics-line:focus-visible { opacity: .85; outline: 0; }
 .lyrics-line.current { opacity: 1; font-weight: 700; }