Added the visual briefing assistant (#893)

app/MindWork AI Studio/Components/MudStepperWithoutActions.razor.cs

@@ -0,0 +1,70 @@
+using Microsoft.AspNetCore.Components;
+
+namespace AIStudio.Components;
+
+/// <summary>
+/// A stepper that leaves the step navigation to the application instead of the user.
+/// </summary>
+/// <remarks>
+/// MudBlazor renders Previous, Next, Skip, and Complete buttons by default. AI Studio drives its
+/// steppers from application state — a running build, or an install flow that advances when each
+/// step succeeds — so those buttons have nothing to do and would only look broken when clicked.
+/// This component removes them once instead of once per assistant, and carries the shared step
+/// colors so the steppers stay visually consistent.
+/// </remarks>
+public partial class MudStepperWithoutActions : ComponentBase
+{
+    /// <summary>
+    /// Gets or sets the step the stepper points at.
+    /// </summary>
+    [Parameter]
+    public int ActiveIndex { get; set; }
+
+    /// <summary>
+    /// Gets or sets the callback raised when the active step changed.
+    /// </summary>
+    [Parameter]
+    public EventCallback<int> ActiveIndexChanged { get; set; }
+
+    /// <summary>
+    /// Gets or sets whether the user must not change the active step.
+    /// </summary>
+    /// <remarks>
+    /// Set this when the displayed process runs on its own. The step headers stay visible, but
+    /// clicking them no longer moves the stepper away from the step the application selected.
+    /// </remarks>
+    [Parameter]
+    public bool ReadOnly { get; set; }
+
+    /// <summary>
+    /// Gets or sets additional CSS classes for the stepper.
+    /// </summary>
+    [Parameter]
+    public string Class { get; set; } = string.Empty;
+
+    /// <summary>
+    /// Gets or sets the steps to render.
+    /// </summary>
+    [Parameter]
+    public RenderFragment? ChildContent { get; set; }
+
+    /// <summary>
+    /// The marker class that lets app.css hide the action bar MudBlazor renders around the actions.
+    /// </summary>
+    private const string MARKER_CLASS = "mud-stepper-without-actions";
+
+    private string Classname => string.IsNullOrWhiteSpace(this.Class) ? MARKER_CLASS : $"{MARKER_CLASS} {this.Class}";
+
+    /// <summary>
+    /// Blocks step changes that the user triggered while the stepper is read-only.
+    /// </summary>
+    /// <param name="args">The interaction to inspect.</param>
+    /// <returns>A completed task.</returns>
+    private Task PreviewInteractionAsync(StepperInteractionEventArgs args)
+    {
+        if (this.ReadOnly)
+            args.Cancel = true;
+
+        return Task.CompletedTask;
+    }
+}