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/log_config.py

@@ -5,12 +5,96 @@ GUI 日志配置模块
 统一配置 GUI 应用和控制台的日志输出
 """
 import logging
+from typing import Dict
+from tkinter import font as tk_font
+
 
 # 日志格式配置
 LOG_FORMAT = '%(asctime)s [%(levelname)s] %(message)s'
 DATE_FORMAT = '%Y-%m-%d %H:%M:%S'
 
 
+class LogTheme:
+    """
+    统一的日志主题配置
+
+    提供颜色、字体等样式配置，支持未来的主题切换（如暗色模式）
+    """
+
+    # 颜色方案
+    COLORS = {
+        'INFO': '#000000',      # 黑色
+        'SUCCESS': '#008000',   # 绿色
+        'WARNING': '#FF8C00',   # 深橙色
+        'ERROR': '#FF0000',     # 红色
+        'DEBUG': '#808080',     # 灰色
+    }
+
+    # 字体配置
+    FONTS = {
+        'DEFAULT': ('TkDefaultFont', 9),
+        'HEADER': ('TkDefaultFont', 10, 'bold'),
+        'MONOSPACE': ('Consolas', 9),
+        'MONOSPACE_SMALL': ('Consolas', 8),
+    }
+
+    # 背景颜色（用于未来的暗色模式支持）
+    BACKGROUNDS = {
+        'LIGHT': '#FFFFFF',
+        'DARK': '#1E1E1E',
+    }
+
+    # 当前主题
+    _current_theme = 'LIGHT'
+
+    @classmethod
+    def get_color(cls, level: str) -> str:
+        """
+        获取指定日志级别的颜色
+
+        Args:
+            level: 日志级别 (INFO, SUCCESS, WARNING, ERROR, DEBUG)
+
+        Returns:
+            颜色值（十六进制字符串）
+        """
+        return cls.COLORS.get(level.upper(), '#000000')
+
+    @classmethod
+    def get_font(cls, font_name: str = 'DEFAULT'):
+        """
+        获取指定字体配置
+
+        Args:
+            font_name: 字体名称 (DEFAULT, HEADER, MONOSPACE, MONOSPACE_SMALL)
+
+        Returns:
+            字体配置元组
+        """
+        return cls.FONTS.get(font_name, cls.FONTS['DEFAULT'])
+
+    @classmethod
+    def set_theme(cls, theme: str):
+        """
+        设置主题（LIGHT 或 DARK）
+
+        Args:
+            theme: 主题名称
+        """
+        if theme.upper() in ['LIGHT', 'DARK']:
+            cls._current_theme = theme.upper()
+
+    @classmethod
+    def get_background(cls) -> str:
+        """
+        获取当前主题的背景颜色
+
+        Returns:
+            背景颜色值
+        """
+        return cls.BACKGROUNDS.get(cls._current_theme, '#FFFFFF')
+
+
 def setup_gui_logging(level=logging.INFO):
     """
     初始化 GUI 应用的日志配置