Update HeaderComponent HTML: adjust access check condition to use SCOPE_head_mod instead of HEAD_MOD.

frontend/src/app/pages/header/header/header.component.html

@@ -141,7 +141,7 @@
             <li class="nav_li">
               <a [id]="getCurrentPageId(['particles'])"
                  class="nav_link fake_link" [ngClass]="active">Special</a>
-              @if (hasAccess(['HEAD_MOD'])) {
+              @if (hasAccess(['SCOPE_head_mod'])) {
                 <ul class="dropdown">
                   <li class="nav_li"><a class="nav_link2" [routerLink]="['/particles']">Particles</a></li>
                 </ul>