Add Diffusers model format and unknown handling

StabilityMatrix.Avalonia/App.axaml.cs

@@ -424,6 +424,7 @@ public sealed class App : Application
         jsonSerializerOptions.Converters.Add(new ObjectToInferredTypesConverter());
         jsonSerializerOptions.Converters.Add(new DefaultUnknownEnumConverter<CivitFileType>());
         jsonSerializerOptions.Converters.Add(new DefaultUnknownEnumConverter<CivitModelType>());
+        jsonSerializerOptions.Converters.Add(new DefaultUnknownEnumConverter<CivitModelFormat>());
         jsonSerializerOptions.Converters.Add(
             new JsonStringEnumConverter(JsonNamingPolicy.CamelCase)
         );

StabilityMatrix.Core/Models/Api/CivitModelFormat.cs

@@ -1,12 +1,14 @@
 using System.Text.Json.Serialization;
+using StabilityMatrix.Core.Converters.Json;
 
 namespace StabilityMatrix.Core.Models.Api;
 
-
-[JsonConverter(typeof(JsonStringEnumConverter))]
+[JsonConverter(typeof(DefaultUnknownEnumConverter<CivitModelFormat>))]
 public enum CivitModelFormat
 {
+    Unknown,
     SafeTensor,
     PickleTensor,
+    Diffusers,
     Other
 }