add arxiv link

Author: OasisArtisan

index.html

@@ -113,7 +113,7 @@ <h1 class="title is-1 publication-title"><img src="static/images/logo.gif" width
                 </a>
               </span>
               <span class="link-block">
-                <a href=""
+                <a href="https://arxiv.org/abs/2504.06994"
                    class="external-link button is-normal is-rounded is-dark">
                   <span class="icon">
                       <i class="ai ai-arxiv"></i>