feat: 启用避免全屏助手时自动全屏处理白板和批注模式

- 进入白板/批注模式时自动全屏
- 退出时恢复工作区域大小
- 添加状态跟踪避免重复处理
- PPT放映模式和白板模式切换时正确管理全屏状态

Ink Canvas/Helpers/PPTUIManager.cs

@@ -107,6 +107,8 @@ namespace Ink_Canvas.Helpers
                                     System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width,
                                     System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height, true);
                             }), DispatcherPriority.ApplicationIdle);
+                            
+                            _mainWindow.isFullScreenApplied = true; // 标记已应用全屏处理
                         }
                     }
                     else
@@ -127,6 +129,8 @@ namespace Ink_Canvas.Helpers
                                     workingArea.X, workingArea.Y,
                                     workingArea.Width, workingArea.Height, true);
                             }), DispatcherPriority.ApplicationIdle);
+                            
+                            _mainWindow.isFullScreenApplied = false; // 标记全屏处理已还原
                         }
                     }
                 }

Ink Canvas/MainWindow.xaml.cs

@@ -67,6 +67,9 @@ namespace Ink_Canvas
         // 设置面板相关状态
         private bool userChangedNoFocusModeInSettings;
         private bool isTemporarilyDisablingNoFocusMode = false;
+        
+        // 全屏处理状态标志
+        public bool isFullScreenApplied = false;
 
 
 

Ink Canvas/MainWindow_cs/MW_FloatingBarIcons.cs

@@ -3075,6 +3075,8 @@ namespace Ink_Canvas
                                     workingArea.Left, workingArea.Top,
                                     workingArea.Width, workingArea.Height, true);
                             }), DispatcherPriority.ApplicationIdle);
+                            
+                            isFullScreenApplied = false; // 标记全屏处理已还原
                         }
 
                         // 在屏幕模式下恢复基础浮动栏的显示
@@ -3144,6 +3146,8 @@ namespace Ink_Canvas
                                     System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width,
                                     System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height, true);
                             }), DispatcherPriority.ApplicationIdle);
+                            
+                            isFullScreenApplied = true; // 标记已应用全屏处理
                         }
 
                         ViewboxFloatingBar.Visibility = Visibility.Collapsed;
@@ -3201,6 +3205,7 @@ namespace Ink_Canvas
         {
             if (GridTransparencyFakeBackground.Background == Brushes.Transparent)
             {
+                // 进入批注模式
                 GridTransparencyFakeBackground.Opacity = 1;
                 GridTransparencyFakeBackground.Background = new SolidColorBrush(StringToColor("#01FFFFFF"));
                 inkCanvas.IsHitTestVisible = true;
@@ -3225,6 +3230,21 @@ namespace Ink_Canvas
                 }
 
                 BtnHideInkCanvas.Content = "隐藏\n画板";
+                
+                // 进入批注模式时的全屏处理（仅当未应用过全屏处理时）
+                if (Settings.Advanced.IsEnableAvoidFullScreenHelper && !isFullScreenApplied)
+                {
+                    // 设置为画板模式，允许全屏操作
+                    AvoidFullScreenHelper.SetBoardMode(true);
+                    Dispatcher.BeginInvoke(new Action(() =>
+                    {
+                        MainWindow.MoveWindow(new WindowInteropHelper(this).Handle, 0, 0,
+                            System.Windows.Forms.Screen.PrimaryScreen.Bounds.Width,
+                            System.Windows.Forms.Screen.PrimaryScreen.Bounds.Height, true);
+                    }), DispatcherPriority.ApplicationIdle);
+                    
+                    isFullScreenApplied = true; // 标记已应用全屏处理
+                }
             }
             else
             {
@@ -3275,6 +3295,27 @@ namespace Ink_Canvas
 
                 GridBackgroundCoverHolder.Visibility = Visibility.Collapsed;
 
+                // 退出批注模式时的全屏还原（仅当之前应用过全屏处理且不在白板模式时）
+                if (Settings.Advanced.IsEnableAvoidFullScreenHelper && 
+                    isFullScreenApplied && 
+                    currentMode == 0 && // 不在白板模式
+                    BtnPPTSlideShowEnd.Visibility != Visibility.Visible) // 不在PPT放映模式
+                {
+                    // 恢复为非画板模式，重新启用全屏限制
+                    AvoidFullScreenHelper.SetBoardMode(false);
+
+                    Dispatcher.BeginInvoke(new Action(() =>
+                    {
+                        // 退出批注模式，恢复到工作区域大小
+                        var workingArea = System.Windows.Forms.Screen.PrimaryScreen.WorkingArea;
+                        MainWindow.MoveWindow(new WindowInteropHelper(this).Handle, 
+                            workingArea.Left, workingArea.Top,
+                            workingArea.Width, workingArea.Height, true);
+                    }), DispatcherPriority.ApplicationIdle);
+                    
+                    isFullScreenApplied = false; // 标记全屏处理已还原
+                }
+
                 if (currentMode != 0)
                 {
                     SaveStrokes();