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/Components/AssistantModeChoice.razor.cs

@@ -0,0 +1,28 @@
+using Microsoft.AspNetCore.Components;
+
+namespace AIStudio.Components;
+
+/// <summary>
+/// Shows one card per mode with which an assistant can start, and reports the mode the user chose.
+/// </summary>
+/// <remarks>
+/// The assistant shows nothing else until the user chose, so the texts of the options come from the assistant: they
+/// tell what it does in each mode. Generic, so that every assistant names its modes with an enum of its own.
+/// </remarks>
+/// <typeparam name="TMode">The type of the modes of the assistant.</typeparam>
+public partial class AssistantModeChoice<TMode> : ComponentBase
+{
+    /// <summary>
+    /// The options to choose from, in the order the cards show them.
+    /// </summary>
+    [Parameter]
+    public IReadOnlyList<AssistantModeOption<TMode>> Options { get; set; } = [];
+
+    /// <summary>
+    /// Called with the mode of the option the user chose.
+    /// </summary>
+    [Parameter]
+    public EventCallback<TMode> ModeChosen { get; set; }
+
+    private async Task Choose(AssistantModeOption<TMode> option) => await this.ModeChosen.InvokeAsync(option.Mode);
+}