Update PDF link to point to arXiv article

Author: kyfu0106

CRTP/index.html

@@ -172,7 +172,7 @@ <h1 class="title is-3 publication-title" style="color: black !important;">Uncert
             <div class="publication-links">
               <!-- PDF Link. -->
               <span class="link-block">
-									<a href=""
+									<a href="https://arxiv.org/abs/2603.23919"
 										class="external-link button is-normal is-rounded is-dark">
 										<span class="icon">
 											<i class="ai ai-arxiv"></i>