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/user_selection_dialog.py

@@ -1,6 +1,7 @@
 """
 User Selection Dialog - Allows Admin to choose which user identity to use
 """
+
 import tkinter as tk
 from tkinter import ttk, messagebox
 from typing import Optional, Dict, Any, List
@@ -64,9 +65,7 @@ class UserSelectionDialog:
 
         # Title
         title_label = ttk.Label(
-            main_frame,
-            text="请选择要使用的用户身份",
-            font=('', 14, 'bold')
+            main_frame, text="请选择要使用的用户身份", font=("", 14, "bold")
         )
         title_label.pack(pady=(0, 20))
 
@@ -82,12 +81,15 @@ class UserSelectionDialog:
         # Sort users: current user first, then by username
         sorted_users = sorted(
             self.users,
-            key=lambda u: (0 if u['username'] == self.current_username else 1, u['username'])
+            key=lambda u: (
+                0 if u["username"] == self.current_username else 1,
+                u["username"],
+            ),
         )
 
         for user in sorted_users:
-            username = user['username']
-            user_type = user['user_type']
+            username = user["username"]
+            user_type = user["user_type"]
             is_current = username == self.current_username
 
             # Mark current user
@@ -99,7 +101,7 @@ class UserSelectionDialog:
                 list_frame,
                 text=display_text,
                 variable=self.selected_var,
-                value=username
+                value=username,
             )
             rb.pack(anchor=tk.W, pady=3, padx=5)
 
@@ -111,18 +113,12 @@ class UserSelectionDialog:
         button_frame.pack(pady=(20, 0))
 
         confirm_btn = ttk.Button(
-            button_frame,
-            text="确认",
-            command=self._on_confirm,
-            width=10
+            button_frame, text="确认", command=self._on_confirm, width=10
         )
         confirm_btn.pack(side=tk.LEFT, padx=5)
 
         cancel_btn = ttk.Button(
-            button_frame,
-            text="取消",
-            command=self._on_cancel,
-            width=10
+            button_frame, text="取消", command=self._on_cancel, width=10
         )
         cancel_btn.pack(side=tk.LEFT, padx=5)
 
@@ -136,7 +132,7 @@ class UserSelectionDialog:
 
         # Find the selected user
         for user in self.users:
-            if user['username'] == selected_username:
+            if user["username"] == selected_username:
                 self.selected_user = user
                 break