Added the Model Comparison assistant for blind comparisons of two models (#1009)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Assistants/ModelComparison/ModelComparisonShownChat.cs

@@ -0,0 +1,28 @@
+namespace AIStudio.Assistants.ModelComparison;
+
+/// <summary>
+/// The chat of a task which the user works in right now, with what it needs before it shows.
+/// </summary>
+/// <param name="ChatId">The ID of the chat.</param>
+/// <param name="Provider">The provider which answers in the chat.</param>
+/// <param name="OpensWithFirstMessage">Whether the chat starts with a copy of the first message of the first chat, which holds for the second chat.</param>
+public sealed record ModelComparisonShownChat(Guid ChatId, AIStudio.Settings.Provider Provider, bool OpensWithFirstMessage)
+{
+    /// <summary>
+    /// Tells which chat of a task the user works in, and which model answers there.
+    /// </summary>
+    /// <param name="task">The task.</param>
+    /// <param name="firstProvider">The provider of the first model of the series.</param>
+    /// <param name="secondProvider">The provider of the second model of the series.</param>
+    /// <returns>The chat, or null while the user decides or once the task is done.</returns>
+    public static ModelComparisonShownChat? Of(ModelComparisonSeriesTask task, AIStudio.Settings.Provider firstProvider, AIStudio.Settings.Provider secondProvider)
+    {
+        if (task.CurrentChat is not { } chat)
+            return null;
+
+        // The first model answers in the first chat when it was drawn for it, and in the second chat otherwise:
+        var isFirstChat = task.State is ModelComparisonSeriesTaskState.FIRST_CHAT;
+        var provider = isFirstChat == task.FirstModelIsChatOne ? firstProvider : secondProvider;
+        return new(chat.ChatId, provider, !isFirstChat);
+    }
+}