diff --git a/static/js/theme.js b/static/js/theme.js
index 39af3aa..ab539a4 100644
--- a/static/js/theme.js
+++ b/static/js/theme.js
@@ -11,22 +11,20 @@
     function applyCollapsed(collapsed) {
         sidebar.classList.toggle('collapsed', collapsed);
         contentWrapper.classList.toggle('sidebar-collapsed', collapsed);
-        const icon = toggleBtn && toggleBtn.querySelector('i');
-        if (icon) {
-            icon.className = collapsed ? 'fas fa-chevron-right' : 'fas fa-chevron-left';
-        }
     }
 
     // Restore saved state instantly — suppress transitions so there's no
     // collapse animation flash on every page navigation.
     sidebar.style.transition = 'none';
     contentWrapper.style.transition = 'none';
+    if (toggleBtn) toggleBtn.style.transition = 'none';
     applyCollapsed(localStorage.getItem(COLLAPSED_KEY) === '1');
     // Re-enable transitions after one frame so the toggle button still animates.
     requestAnimationFrame(function () {
         requestAnimationFrame(function () {
             sidebar.style.transition = '';
             contentWrapper.style.transition = '';
+            if (toggleBtn) toggleBtn.style.transition = '';
         });
     });