fix: Prevent 'duplicate' status from triggering success banner

frontend/app.js

@@ -160,7 +160,7 @@ function render(){
 
   if (!allCompleteBannerShown && items.length > 0) {
     const isComplete = items.every(it => FINAL_STATES.has(it.status));
-    const hasSuccess = items.some(it => it.status === 'done' || it.status === 'duplicate');
+    const hasSuccess = items.some(it => it.status === 'done');
     if (isComplete && hasSuccess) {
       showBanner("All uploads complete.", "ok");
       allCompleteBannerShown = true;