style: fix code formatting with black, isort, and flake8

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

tests/test_filename_utils.py

@@ -4,11 +4,12 @@ Tests for app/utils/filename_utils.py
 Tests filename sanitization and manipulation functions.
 """
 
-import pytest
 import os
+from datetime import datetime
 from pathlib import Path
 from unittest.mock import Mock, patch
-from datetime import datetime
+
+import pytest
 
 
 @pytest.mark.unit
@@ -259,7 +260,6 @@ class TestFilenameUtilsEdgeCases:
         assert "?" not in result
 
 
-
 @pytest.mark.unit
 class TestUniqueFilepathWithCounter:
     """Test unique filepath generation with numeric counter suffix"""