Initial commit: WpywMail 自建邮件系统：.NET 8 原生 SMTP/IMAP 服务端（DKIM 签名、SPF/DKIM/DMARC 入站校验、SQLite 存储、完整账号体系）、Node 服务端、WinUI 3 客户端与 Web 前端

client-winui/Converters.cs

@@ -0,0 +1,20 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Data;
+
+namespace WpywMail.Client;
+
+public sealed class UnreadBackgroundConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, string language) =>
+        value is true ? Application.Current.Resources["AccentSubtleBrush"] : Application.Current.Resources["SurfaceBrush"];
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language) => throw new NotSupportedException();
+}
+
+public sealed class UnreadWeightConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, string language) =>
+        value is true ? Microsoft.UI.Text.FontWeights.SemiBold : Microsoft.UI.Text.FontWeights.Normal;
+
+    public object ConvertBack(object value, Type targetType, object parameter, string language) => throw new NotSupportedException();
+}