Fix formatting issue in test_drag_interceptor.py and ensure signal connection for drag_started

tests/unit/test_drag_interceptor.py

@@ -3,7 +3,6 @@
 from pathlib import Path
 from unittest.mock import MagicMock, patch
 
-
 from webdrop_bridge.core.drag_interceptor import DragInterceptor
 from webdrop_bridge.core.validator import PathValidator
 
@@ -191,6 +190,7 @@ class TestDragInterceptorSignals:
         interceptor.set_validator(validator)
 
         from PySide6.QtCore import Qt
+
         # Connect to signal manually
         signal_spy = []
         interceptor.drag_started.connect(lambda paths: signal_spy.append(paths))