add notificationcard resource colors to dark and light themes

src/Avalonia.Themes.Default/Accents/BaseDark.xaml

@@ -52,8 +52,6 @@
         <SolidColorBrush x:Key="NotificationCardWarningBackgroundBrush" Color="Orange"/>
         <SolidColorBrush x:Key="NotificationCardErrorBackgroundBrush" Color="OrangeRed"/>
 
-
-
         <Thickness x:Key="ThemeBorderThickness">1,1,1,1</Thickness>
         <sys:Double x:Key="ThemeDisabledOpacity">0.5</sys:Double>
 

src/Avalonia.Themes.Default/Accents/BaseLight.xaml

@@ -46,6 +46,12 @@
         <SolidColorBrush x:Key="ErrorBrush" Color="{DynamicResource ErrorColor}"></SolidColorBrush>
         <SolidColorBrush x:Key="ErrorLowBrush" Color="{DynamicResource ErrorLowColor}"></SolidColorBrush>
 
+        <SolidColorBrush x:Key="NotificationCardBackgroundBrush" Color="#444444"/>
+        <SolidColorBrush x:Key="NotificationCardInformationBackgroundBrush" Color="Teal"/>
+        <SolidColorBrush x:Key="NotificationCardSuccessBackgroundBrush" Color="LimeGreen"/>
+        <SolidColorBrush x:Key="NotificationCardWarningBackgroundBrush" Color="Orange"/>
+        <SolidColorBrush x:Key="NotificationCardErrorBackgroundBrush" Color="OrangeRed"/>
+
         <Thickness x:Key="ThemeBorderThickness">1</Thickness>
         <sys:Double x:Key="ThemeDisabledOpacity">0.5</sys:Double>