fix: resolve 48 lint errors in test files

- Remove whitespace from 22 blank lines (W293)
- Remove 6 unused imports (F401): os, Mock, MagicMock, Path
- Add missing imports for 12 test functions (F821): sanitize_filename, extract_remote_path, MagicMock
- Fix 1 unsorted import block (I001)

All ruff checks now pass successfully.

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

tests/test_auth.py

@@ -361,9 +361,7 @@ class TestOAuthLogin:
             result = await oauth_login(mock_request)
 
             assert result == "oauth_redirect"
-            mock_authentik.authorize_redirect.assert_called_once_with(
-                mock_request, "http://localhost/oauth-callback"
-            )
+            mock_authentik.authorize_redirect.assert_called_once_with(mock_request, "http://localhost/oauth-callback")
 
 
 @pytest.mark.unit