Improve desktop sidebar collapse behavior

components/sidebar.html

@@ -23,7 +23,8 @@
             <span class="sidebar-toggle-label">Collapse</span>
             <svg
               data-sidebar-chevron
-              class="w-4 h-4 transform transition-transform duration-300"
+              class="w-4 h-4 transform transition-transform duration-300 sidebar-toggle-icon--rotated"
+              aria-hidden="true"
               xmlns="http://www.w3.org/2000/svg"
               viewBox="0 0 24 24"
               fill="none"