add:兼容性变更提示

Ink Canvas/MainWindow.xaml

@@ -642,15 +642,15 @@
                                                TextWrapping="Wrap"
                                                Foreground="#FF2A2A2A"
                                                FontSize="14"
-                                               Text="此版本为最后一个基于.net framework 4.7.2版本，您需要手动确认才能继续接受自动更新。" />
+                                               Text="此版本为最后一个基于.NET Framework 4.7.2的版本，您需要手动确认才能继续接受自动更新。" />
                                     <Button Grid.Column="1"
                                             Margin="14,0,0,0"
                                             Padding="18,6"
                                             MinWidth="92"
                                             Click="ConfirmNetCompatibilityChangeButton_Click"
-                                            Background="#FFF0C24B"
+                                            Background="#FFFFFFFF"
-                                            BorderBrush="#FFE0A800"
+                                            BorderBrush="#FFE5E7EB"
-                                            Foreground="#FF1F1F1F"
+                                            Foreground="#FF111827"
                                             Content="确认">
                                         <Button.Template>
                                             <ControlTemplate TargetType="{x:Type Button}">
@@ -667,10 +667,12 @@
                                                 </Border>
                                                 <ControlTemplate.Triggers>
                                                     <Trigger Property="IsMouseOver" Value="True">
-                                                        <Setter TargetName="Bd" Property="Background" Value="#FFE9B53C" />
+                                                        <Setter TargetName="Bd" Property="Background" Value="#FFF9FAFB" />
+                                                        <Setter TargetName="Bd" Property="BorderBrush" Value="#FFD1D5DB" />
                                                     </Trigger>
                                                     <Trigger Property="IsPressed" Value="True">
-                                                        <Setter TargetName="Bd" Property="Background" Value="#FFDCA628" />
+                                                        <Setter TargetName="Bd" Property="Background" Value="#FFF3F4F6" />
+                                                        <Setter TargetName="Bd" Property="BorderBrush" Value="#FF9CA3AF" />
                                                     </Trigger>
                                                     <Trigger Property="IsEnabled" Value="False">
                                                         <Setter TargetName="Bd" Property="Background" Value="#FFE7E7E7" />

Ink Canvas/MainWindow.xaml.cs

@@ -1180,7 +1180,7 @@ namespace Ink_Canvas
             loadPenCanvas();
             //加载设置
             LoadSettings(true);
-            ShowNetCompatibilityChangePromptIfNeeded();
+            ScheduleNetCompatibilityChangePromptAfterStartup();
             ApplyLanguageFromSettings();
             AutoBackupManager.Initialize(Settings);
             CheckUpdateChannelAndTelemetryConsistency();
@@ -1506,7 +1506,7 @@ namespace Ink_Canvas
         {
             try
             {
-                if (Settings?.Startup?.HasConfirmedNetCompatibilityChange == true)
+                if (IsNetCompatibilityChangeConfirmed())
                 {
                     return;
                 }
@@ -1523,6 +1523,87 @@ namespace Ink_Canvas
             }
         }
 
+        private void ScheduleNetCompatibilityChangePromptAfterStartup()
+        {
+            Dispatcher.BeginInvoke(new Action(async () =>
+            {
+                try
+                {
+                    // 等待主窗口启动流程与初始渲染基本完成后再提示，避免“刚启动就弹窗”。
+                    await Task.Delay(1000);
+                    ShowNetCompatibilityChangePromptIfNeeded();
+                }
+                catch (Exception ex)
+                {
+                    LogHelper.WriteLogToFile($"延迟显示兼容性变更提示失败: {ex.Message}", LogHelper.LogType.Error);
+                }
+            }), DispatcherPriority.ApplicationIdle);
+        }
+
+        private string GetNetCompatibilityConfirmationFlagPath()
+        {
+            return Path.Combine(App.RootPath, "Configs", "NetCompatibilityConfirmed.flag");
+        }
+
+        private bool IsNetCompatibilityChangeConfirmed()
+        {
+            if (Settings?.Startup?.HasConfirmedNetCompatibilityChange == true)
+            {
+                return true;
+            }
+
+            try
+            {
+                var flagPath = GetNetCompatibilityConfirmationFlagPath();
+                if (File.Exists(flagPath))
+                {
+                    if (Settings?.Startup != null && !Settings.Startup.HasConfirmedNetCompatibilityChange)
+                    {
+                        Settings.Startup.HasConfirmedNetCompatibilityChange = true;
+                        SaveSettingsToFile();
+                    }
+                    return true;
+                }
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"读取兼容性确认标记失败: {ex.Message}", LogHelper.LogType.Error);
+            }
+
+            return false;
+        }
+
+        private void PersistNetCompatibilityChangeConfirmation()
+        {
+            if (Settings?.Startup == null)
+            {
+                Settings.Startup = new Startup();
+            }
+
+            Settings.Startup.HasConfirmedNetCompatibilityChange = true;
+
+            try
+            {
+                var flagPath = GetNetCompatibilityConfirmationFlagPath();
+                var dir = Path.GetDirectoryName(flagPath);
+                if (!string.IsNullOrWhiteSpace(dir) && !Directory.Exists(dir))
+                {
+                    Directory.CreateDirectory(dir);
+                }
+
+                if (!File.Exists(flagPath))
+                {
+                    File.WriteAllText(flagPath, "confirmed=true");
+                }
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"写入兼容性确认标记失败: {ex.Message}", LogHelper.LogType.Error);
+            }
+
+            SaveSettingsToFile();
+        }
+
         private void ApplyLanguageFromSettings()
         {
             try

Ink Canvas/MainWindow_cs/MW_Settings.cs

@@ -5360,13 +5360,7 @@ namespace Ink_Canvas
         {
             try
             {
-                if (Settings?.Startup == null)
+                PersistNetCompatibilityChangeConfirmation();
-                {
-                    Settings.Startup = new Startup();
-                }
-
-                Settings.Startup.HasConfirmedNetCompatibilityChange = true;
-                SaveSettingsToFile();
 
                 if (Net472CompatibilityWarningPanel != null)
                 {