优化更新代码，添加界面功能并整合

WPFluent/Controls/NavigationView/NavigationViewBreadcrumbItem.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"
+    xmlns:controls="clr-namespace:WPFluent.Controls">
+
+    <DataTemplate x:Key="NavigationViewItemDataTemplate" DataType="{x:Type controls:NavigationViewBreadcrumbItem}">
+        <controls:TextBlock FontTypography="Title" Text="{Binding Content}" />
+    </DataTemplate>
+
+</ResourceDictionary>