Added PowerPoint templates to the Slide Assistant (#1055)

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

app/MindWork AI Studio/Tools/PowerPoint/TemplateSlot.cs

@@ -0,0 +1,45 @@
+namespace AIStudio.Tools.PowerPoint;
+
+/// <summary>
+/// One placeholder of a slide layout which the content of a slide goes into.
+/// </summary>
+/// <param name="Role">What the slot is for.</param>
+/// <param name="Ordinal">The number of the slot among the slots of the same role, starting at 1, in reading order.</param>
+/// <param name="Bounds">Where the slot sits, inherited from the slide master when the layout does not say.</param>
+/// <param name="PlaceholderType">The placeholder type as the file spells it, e.g., "body" or "pic"; "obj" when the file states none.</param>
+/// <param name="PlaceholderIndex">The placeholder index, which links a placeholder of a slide to the one of its layout.</param>
+/// <param name="Capacity">How much text fits; missing for pictures.</param>
+internal sealed record TemplateSlot(PlaceholderRole Role, int Ordinal, SlotBounds Bounds, string PlaceholderType, uint? PlaceholderIndex, TextCapacity? Capacity)
+{
+    /// <summary>
+    /// The slot as the layout offers it, which a slot a slide moved or copied is measured against;
+    /// null for a slot of the layout itself.
+    /// </summary>
+    public TemplateSlot? LayoutSlot { get; init; }
+
+    /// <summary>
+    /// The slot where a slide moved or resized its placeholder.
+    /// </summary>
+    /// <remarks>
+    /// The capacity grows and shrinks with the size, since the slide keeps the font. Insets stay as
+    /// they are on a smaller slot, so the estimate runs a little high there; the check of the
+    /// model's answer accepts a line more anyway. The capacity is always scaled from the slot of the
+    /// layout, so that a slot moved twice, e.g., resized by its slide and then grown into room the
+    /// slide frees, is not rounded down twice.
+    /// </remarks>
+    /// <param name="bounds">Where the slide puts the placeholder.</param>
+    public TemplateSlot MovedTo(SlotBounds bounds)
+    {
+        var layoutSlot = this.LayoutSlot ?? this;
+        return this with
+        {
+            Bounds = bounds,
+            Capacity = layoutSlot.Capacity is { } capacity
+                ? new TextCapacity(
+                    Math.Max(1, (int)(capacity.Lines * (double)bounds.Height / Math.Max(1, layoutSlot.Bounds.Height))),
+                    Math.Max(1, (int)(capacity.CharactersPerLine * (double)bounds.Width / Math.Max(1, layoutSlot.Bounds.Width))))
+                : null,
+            LayoutSlot = layoutSlot,
+        };
+    }
+}