Update app.py

app.py

@@ -70,7 +70,10 @@ DEVICE = "cuda"
 # 2. Empty cache for our heavy objects
 _model_cache = {}
 
-
+def first_file_from_dir(directory, ext):
+    files = glob.glob(os.path.join(directory, f"*.{ext}"))
+    return sorted(files)[0] if files else None#
+    
 # Utility to select first image from a folder
 def first_image_from_dir(directory):
     patterns = ["*.jpg", "*.png", "*.jpeg"]