Added a settings dialog with organization-managed defaults to the Assistant Builder (#908)

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

app/MindWork AI Studio/Settings/DataModel/Data.cs

@@ -206,6 +206,11 @@ public sealed class Data
     
     public DataSlideBuilder SlideBuilder { get; init; } = new();
 
+    /// <summary>
+    /// Gets the managed Assistant Builder defaults.
+    /// </summary>
+    public DataAssistantBuilder AssistantBuilder { get; init; } = new(x => x.AssistantBuilder);
+
     /// <summary>
     /// Gets the managed Visual Briefing Assistant defaults.
     /// </summary>