Added a SWOT analysis assistant (#1122)

Co-authored-by: hart_s3 <sabrina.hartmann@dlr.de>

app/MindWork AI Studio/Chat/ContentPresentation.cs

@@ -0,0 +1,58 @@
+using System.Text.Json;
+
+namespace AIStudio.Chat;
+
+/// <summary>
+/// Structured data which a renderer may use instead of the canonical text of a message.
+/// </summary>
+/// <remarks>
+/// The text stays canonical: providers, copying, exporting, and every renderer which does not know
+/// the presentation use it. ContentPresentationView shows the presentation instead, and falls back to
+/// the text when its data cannot be read, e.g., from a chat file which was changed by hand.
+/// </remarks>
+public sealed class ContentPresentation
+{
+    private JsonElement? data;
+    private int? dataHashCode;
+
+    /// <summary>
+    /// The renderer which understands the data.
+    /// </summary>
+    public ContentPresentationKind Kind { get; set; } = ContentPresentationKind.NONE;
+
+    /// <summary>
+    /// The renderer-specific data.
+    /// </summary>
+    public JsonElement? Data
+    {
+        get => this.data;
+        set
+        {
+            this.data = value;
+            this.dataHashCode = null;
+        }
+    }
+
+    internal static ContentPresentation Create<T>(ContentPresentationKind kind, T data) => new()
+    {
+        Kind = kind,
+        Data = JsonSerializer.SerializeToElement(data),
+    };
+
+    internal ContentPresentation DeepClone() => new()
+    {
+        Kind = this.Kind,
+        Data = this.Data?.Clone(),
+    };
+
+    /// <summary>
+    /// A hash code of the data, for telling whether it changed.
+    /// </summary>
+    /// <remarks>
+    /// Computed once per data, since every render of a message asks for it and computing means
+    /// writing out the whole data.
+    /// </remarks>
+    internal int GetDataHashCode() => this.dataHashCode ??= this.Data is not { ValueKind: not JsonValueKind.Undefined } value
+        ? 0
+        : value.GetRawText().GetHashCode(StringComparison.Ordinal);
+}