优化更新代码，添加界面功能并整合

WPFluent/Controls/Toast/ToastControl.xaml

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+<UserControl
+    x:Class="WPFluent.Controls.ToastControl"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:conv="clr-namespace:WPFluent.Converters"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    MinWidth="50"
+    MaxWidth="500"
+    d:DesignHeight="35"
+    d:DesignWidth="120"
+    Focusable="False"
+    FontSize="16"
+    Opacity="1"
+    mc:Ignorable="d">
+    <UserControl.Resources>
+        <FontFamily x:Key="SymbolThemeFontFamily">pack://application:,,,/WPFluent;component/Resources/Fonts/Segoe Fluent Icons.ttf#Segoe Fluent Icons</FontFamily>
+    </UserControl.Resources>
+    <Border
+        Padding="8"
+        Background="{DynamicResource ApplicationBackgroundBrush}"
+        BorderBrush="{DynamicResource ControlElevationBorderBrush}"
+        BorderThickness="{Binding BorderThickness}"
+        CornerRadius="{Binding CornerRadius}">
+        <Grid>
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="Auto" />
+                <ColumnDefinition Width="*" />
+            </Grid.ColumnDefinitions>
+            <TextBlock
+                Grid.Column="0"
+                Width="16"
+                Height="16"
+                Margin="0,0,6,0"
+                HorizontalAlignment="Center"
+                VerticalAlignment="Center"
+                FontFamily="{DynamicResource SymbolThemeFontFamily}"
+                FontSize="{Binding IconSize}"
+                Foreground="{Binding ToastIcon, Converter={x:Static conv:ToastIconForegroundConverter.New}}"
+                Text="{Binding ToastIcon, Converter={x:Static conv:ToastIconConverter.New}}"
+                Visibility="{Binding ToastIcon, Converter={x:Static conv:ToastIconVisibilityConverter.New}}" />
+            <TextBlock
+                Grid.Column="1"
+                HorizontalAlignment="{Binding HorizontalContentAlignment}"
+                VerticalAlignment="{Binding VerticalContentAlignment}"
+                FontFamily="{DynamicResource TextThemeFontFamily}"
+                FontSize="{Binding FontSize}"
+                FontStretch="{Binding FontStretch}"
+                FontStyle="{Binding FontStyle}"
+                FontWeight="{Binding FontWeight}"
+                Foreground="{DynamicResource TextControlForeground}"
+                Text="{Binding Message}" />
+        </Grid>
+    </Border>
+</UserControl>