优化更新代码，添加界面功能并整合

WPFluent/Resources/DefaultFocusVisualStyle.xaml

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+<!--
+    This Source Code Form is subject to the terms of the MIT License.
+    If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+    Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+    All Rights Reserved.
+-->
+
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <Style x:Key="DefaultControlFocusVisualStyle">
+        <Setter Property="Control.Template">
+            <Setter.Value>
+                <ControlTemplate>
+                    <Rectangle
+                        RadiusX="4"
+                        RadiusY="4"
+                        SnapsToDevicePixels="True"
+                        Stroke="{DynamicResource KeyboardFocusBorderColorBrush}"
+                        StrokeThickness="1" />
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
+    <Style x:Key="{x:Static SystemParameters.FocusVisualStyleKey}" BasedOn="{StaticResource DefaultControlFocusVisualStyle}" />
+
+</ResourceDictionary>