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/constants.py

@@ -45,11 +45,11 @@ HEADING_STORE_DELAY_MS = 100
 
 # 日志级别对应的颜色
 LOG_COLORS = {
-    "INFO": "#000000",      # 黑色
-    "SUCCESS": "#008000",   # 绿色
-    "WARNING": "#FF8C00",   # 橙色
-    "ERROR": "#FF0000",     # 红色
-    "DEBUG": "#808080",     # 灰色
+    "INFO": "#000000",  # 黑色
+    "SUCCESS": "#008000",  # 绿色
+    "WARNING": "#FF8C00",  # 橙色
+    "ERROR": "#FF0000",  # 红色
+    "DEBUG": "#808080",  # 灰色
 }
 
 # ============================================================================
@@ -109,4 +109,4 @@ DEFAULT_DB_BATCH_SIZE = 2000
 CHECKBOX_CHECKED = "☑"
 
 # 未选中状态
-CHECKBOX_UNCHECKED = "☐"
+CHECKBOX_UNCHECKED = "☐"