Update app.py

app.py

@@ -80,7 +80,7 @@ def view_pdf():
         print("⚙️ Using cached PDF — already processed.")
 
     # Pass page & zoom to the viewer
-    return render_template("viewer.html", start_page=page, start_zoom=zoom)
+    return render_template("gui.html", start_page=page, start_zoom=zoom)
 
 
 @app.route('/get-pdf')