fix mobile tap to open links with touchend and CSS

src/App.jsx

@@ -113,6 +113,7 @@ function TetrisPiece({ piece, isDark }) {
         onMouseEnter={handleMouseEnter}
         onMouseLeave={handleMouseLeave}
         onClick={handleClick}
+        onTouchEnd={handleClick}
       >
         <a 
           href={piece.link} 

src/index.css

@@ -24,6 +24,11 @@
 
 * { margin: 0; padding: 0; box-sizing: border-box; }
 
+.tetris-piece, .tetris-piece * {
+  touch-action: manipulation;
+  -webkit-tap-highlight-color: transparent;
+}
+
 html, body {
   width: 100%;
   overflow-x: hidden;