Changed delete_folder function to be compatible with windows.

Author: VitjanZ

file_utils.py

@@ -95,7 +95,10 @@ def list_folders_in_directory(directory):
 # delete a folder and all its subfolders and files
 def delete_folder(folder_name):
     if os.path.exists(folder_name):
-        shutil.rmtree(folder_name)
+        # Use writable-aware deletion so read-only files (e.g. .git objects on Windows) don't cause PermissionError
+        delete_files_and_subfolders(folder_name)
+        _make_writable(folder_name)
+        os.rmdir(folder_name)
 
 
 def _make_writable(path: str) -> None: