add microsoft clarity (#738)

frontend/apps/editor3d/app/index.html

@@ -14,6 +14,15 @@
       gtag('config', 'G-Y4Y8KMLPQ7');
     </script>
 
+    <!-- Microsoft Clarity -->
+    <script type="text/javascript">
+      (function(c,l,a,r,i,t,y){
+          c[a]=c[a]||function(){(c[a].q=c[a].q||[]).push(arguments)};
+          t=l.createElement(r);t.async=1;t.src="https://www.clarity.ms/tag/"+i;
+          y=l.getElementsByTagName(r)[0];y.parentNode.insertBefore(t,y);
+      })(window, document, "clarity", "script", "sixp9uu263");
+  </script>
+
     <base href="/" />
     <link rel="icon" type="image/x-icon" href="/favicon.ico" />
     <link rel="preconnect" href="https://fonts.googleapis.com" />