dino-land: add autoplay-safe music toggle on correct CI/CD path

index.php

@@ -13,6 +13,7 @@
   </div>
 
   <canvas id="game" width="960" height="540" aria-label="Dino Land game canvas"></canvas>
+  <button id="musicToggle" type="button" aria-pressed="false" aria-label="Toggle music">🔇 Music: Off</button>
 
   <div id="startScreen">
     <div class="panel">