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/file_selector.py

@@ -21,7 +21,7 @@ class FileSelector(ttk.Frame):
         file_type: str = "file",
         file_types: list = None,
         initial_dir: str = "",
-        on_change: Optional[Callable] = None
+        on_change: Optional[Callable] = None,
     ):
         """
         初始化文件选择器
@@ -64,15 +64,10 @@ class FileSelector(ttk.Frame):
 
         if self.file_type == "file":
             path = filedialog.askopenfilename(
-                title="选择文件",
-                initialdir=current_path,
-                filetypes=self.file_types
+                title="选择文件", initialdir=current_path, filetypes=self.file_types
             )
         else:  # directory
-            path = filedialog.askdirectory(
-                title="选择目录",
-                initialdir=current_path
-            )
+            path = filedialog.askdirectory(title="选择目录", initialdir=current_path)
 
         if path:
             self.entry_var.set(path)