Bug fixes.

js/enhanced-main.js

@@ -69,7 +69,7 @@ document.addEventListener('DOMContentLoaded', () => {
     }
     
     function updateProgressBar() {
-        if (progressState.totalImages > 0) {
+        if (progressBar && progressState.totalImages > 0) {
             const percentage = (progressState.processedImages / progressState.totalImages) * 100;
             progressBar.style.width = `${Math.min(percentage, 100)}%`;
         }