Added PowerPoint templates to the Slide Assistant (#1055)

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

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

@@ -0,0 +1,21 @@
+namespace AIStudio.Tools.PowerPoint;
+
+/// <summary>
+/// What a picture library offers for one request.
+/// </summary>
+/// <param name="Pictures">The pictures the LLM may choose from, sorted by name: all of them, or a random sample of a large library.</param>
+/// <param name="PictureCount">How many pictures the folder holds in all.</param>
+/// <param name="IconCount">How many of them are icons.</param>
+/// <param name="SkippedFileCount">How many files the folder holds which are neither PNG nor JPEG, e.g., SVG icons.</param>
+internal sealed record PictureLibraryContent(IReadOnlyList<LibraryPicture> Pictures, int PictureCount, int IconCount, int SkippedFileCount)
+{
+    /// <summary>
+    /// No library at all.
+    /// </summary>
+    public static readonly PictureLibraryContent NONE = new([], 0, 0, 0);
+
+    /// <summary>
+    /// Whether the folder holds more pictures than the LLM reads about, so that it gets a random sample.
+    /// </summary>
+    public bool IsSampled => this.PictureCount > this.Pictures.Count;
+}