style: format all Python files with Black

Apply Black formatter to the entire codebase for consistent code style.

Co-Authored-By: Claude (glm-5) <noreply@anthropic.com>

gui/widgets/__init__.py

@@ -12,10 +12,10 @@ from .delete_progress_window import DeleteProgressWindow
 from .checkbox_treeview import CheckboxTreeview
 
 __all__ = [
-    'FileSelector',
-    'LogText',
-    'ProductionIdInput',
-    'GuiTextHandler',
-    'DeleteProgressWindow',
-    'CheckboxTreeview'
+    "FileSelector",
+    "LogText",
+    "ProductionIdInput",
+    "GuiTextHandler",
+    "DeleteProgressWindow",
+    "CheckboxTreeview",
 ]