refactor(设置): 重构设置窗口为独立窗口并移除旧设置面板

移除旧的内置设置面板及相关代码，将设置功能迁移至独立的设置窗口
优化设置窗口的主题同步功能，调整自动化页面布局

Ink Canvas/MainWindow_cs/MW_TrayIcon.cs

@@ -123,20 +123,6 @@ namespace Ink_Canvas
             return true;
         }
 
-        private bool IsLegacySettingsVisible(MainWindow mainWin)
-        {
-            try
-            {
-                var borderSettingsField = typeof(MainWindow).GetField("BorderSettings", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
-                var borderSettings = borderSettingsField?.GetValue(mainWin) as FrameworkElement;
-                return borderSettings?.Visibility == Visibility.Visible;
-            }
-            catch
-            {
-                return false;
-            }
-        }
-
         private void TempShowMainWindowTrayIconMenuItem_Clicked(object sender, RoutedEventArgs e)
         {
             var mainWin = Current.MainWindow as MainWindow;
@@ -224,11 +210,6 @@ namespace Ink_Canvas
                 return;
             }
 
-            if (IsLegacySettingsVisible(mainWin))
-            {
-                return;
-            }
-
             try
             {
                 var method = typeof(MainWindow).GetMethod("BtnSettings_Click", BindingFlags.NonPublic | BindingFlags.Instance);