Fixed attached files silently reaching the AI as empty documents (#904)

app/MindWork AI Studio/Tools/ContentStreamMetadataJsonConverter.cs

@@ -23,7 +23,8 @@ public sealed class ContentStreamMetadataJsonConverter : JsonConverter<ContentSt
             "Presentation" => JsonSerializer.Deserialize<ContentStreamPresentationMetadata?>(rawText, options),
             "Image" => JsonSerializer.Deserialize<ContentStreamImageMetadata?>(rawText, options),
             "Document" => JsonSerializer.Deserialize<ContentStreamDocumentMetadata?>(rawText, options),
-            
+            "Error" => JsonSerializer.Deserialize<ContentStreamErrorMetadata?>(rawText, options),
+
             _ => null
         };
     }