refactor: implement UI code optimization and refactoring

This commit implements the comprehensive UI code refactoring plan to improve
code quality, reduce duplication, and enhance maintainability.

Phase 1: High Priority Improvements
- Create BaseDialog class to eliminate window centering code duplication
  across ProgressDialog, DeleteProgressWindow, LoginDialog, and
  UserSelectionDialog (~30 lines of duplicate code removed)
- Unify log color configuration with LogTheme class in gui/log_config.py
- Create permission check decorators (@require_admin, @require_permission,
  @require_user_type, @handle_errors)
- Update all dialog classes to use unified patterns

Phase 2: Architecture Improvements
- Create input validation framework (ValidationResult, Validator,
  ValidatedWidget classes)
- Implement StateManager with observer pattern for component state sharing
- Create unified ErrorHandler for consistent error handling
- Extract CheckboxTreeview into reusable component

New Modules:
- gui/widgets/base_dialog.py - Base dialog class with modal setup and centering
- gui/utils/decorators.py - Permission and error handling decorators
- gui/utils/error_handler.py - Unified error handling with user-friendly messages
- gui/utils/state_manager.py - State management with observer pattern
- gui/utils/validators.py - Input validation framework
- gui/material_validation/checkbox_treeview.py - Reusable checkbox table

Modified Files:
- gui/log_config.py - Added LogTheme class for centralized styling
- gui/widgets/log_text.py - Use LogTheme.COLORS
- gui/widgets/progress_dialog.py - Inherit from BaseDialog
- gui/widgets/delete_progress_window.py - Inherit from BaseDialog, use LogTheme
- gui/widgets/__init__.py - Add new exports, optional imports
- gui/login_dialog.py - Use unified centering pattern
- gui/user_selection_dialog.py - Use unified centering pattern
- gui/material_validation_tab.py - Import CheckboxTreeview from new module

Benefits:
- Reduced code duplication by ~200 lines
- Improved maintainability through centralized configuration
- Better abstraction with 5 new reusable base classes
- Enhanced type safety with type hints
- Future-proof theming support via LogTheme

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

gui/widgets/progress_dialog.py

@@ -9,9 +9,10 @@
 import tkinter as tk
 from tkinter import ttk
 from typing import Optional, Callable
+from gui.widgets.base_dialog import BaseDialog
 
 
-class ProgressDialog:
+class ProgressDialog(BaseDialog):
     """进度对话框"""
 
     def __init__(
@@ -32,42 +33,46 @@ class ProgressDialog:
             can_cancel: 是否可以取消
             on_cancel: 取消回调函数
         """
-        self.parent = parent
         self.can_cancel = can_cancel
         self.on_cancel = on_cancel
         self.cancelled = False
+        self.message_label = None
+        self.progress = None
+        self.cancel_button = None
 
-        # 创建对话框
-        self.dialog = tk.Toplevel(parent)
-        self.dialog.title(title)
-        self.dialog.resizable(False, False)
-        self.dialog.transient(parent)
-        self.dialog.grab_set()
+        # 调用父类初始化（会自动设置为模态并居中）
+        super().__init__(parent, title)
 
-        # 居中显示
-        self._center()
+        # 设置固定大小
+        self.resizable(False, False)
 
         # 创建内容
         self._create_widgets(message)
 
-    def _center(self):
-        """将对话框居中显示"""
-        self.dialog.update_idletasks()
-        width = 400
-        height = 150
-        x = (self.dialog.winfo_screenwidth() // 2) - (width // 2)
-        y = (self.dialog.winfo_screenheight() // 2) - (height // 2)
-        self.dialog.geometry(f"{width}x{height}+{x}+{y}")
+        # 设置固定大小并重新居中
+        self._set_fixed_size(400, 150)
+
+    def _set_fixed_size(self, width: int, height: int):
+        """
+        设置固定大小并重新居中
+
+        Args:
+            width: 宽度
+            height: 高度
+        """
+        self.update_idletasks()
+        self.geometry(f"{width}x{height}")
+        self._center_window()
 
     def _create_widgets(self, message: str):
         """创建对话框组件"""
         # 消息标签
-        self.message_label = ttk.Label(self.dialog, text=message, wraplength=380)
+        self.message_label = ttk.Label(self, text=message, wraplength=380)
         self.message_label.pack(pady=(20, 10), padx=20)
 
         # 进度条
         self.progress = ttk.Progressbar(
-            self.dialog,
+            self,
             mode='indeterminate',
             length=360
         )
@@ -76,7 +81,7 @@ class ProgressDialog:
 
         # 取消按钮
         if self.can_cancel:
-            button_frame = ttk.Frame(self.dialog)
+            button_frame = ttk.Frame(self)
             button_frame.pack(pady=10)
 
             self.cancel_button = ttk.Button(
@@ -95,8 +100,9 @@ class ProgressDialog:
 
     def update_message(self, message: str):
         """更新显示消息"""
-        self.message_label.config(text=message)
-        self.dialog.update_idletasks()
+        if self.message_label:
+            self.message_label.config(text=message)
+        self.update_idletasks()
 
     def set_progress(self, value: int, maximum: int = 100):
         """
@@ -106,14 +112,16 @@ class ProgressDialog:
             value: 当前进度值
             maximum: 最大值
         """
-        self.progress.config(mode='determinate', maximum=maximum)
-        self.progress['value'] = value
-        self.dialog.update_idletasks()
+        if self.progress:
+            self.progress.config(mode='determinate', maximum=maximum)
+            self.progress['value'] = value
+        self.update_idletasks()
 
     def close(self):
         """关闭对话框"""
-        self.progress.stop()
-        self.dialog.destroy()
+        if self.progress:
+            self.progress.stop()
+        super().close()
 
     def is_cancelled(self) -> bool:
         """检查是否已取消"""