fix:添加niceGui库美化页面

ui/core/state.py

@@ -0,0 +1,13 @@
+import threading
+
+class AppState:
+    def __init__(self):
+        self.stop_event = threading.Event()
+        self.is_running = False
+        # 这些 UI 元素的引用将在 UI 初始化时被赋值
+        self.progress_bar = None
+        self.progress_label = None
+        self.log_element = None
+
+# 创建全局单例
+app_state = AppState()