Added backups of all data, restorable on another computer (#1008)

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

app/MindWork AI Studio/Tools/ChatArchive/ChatArchiveImportPreview.cs

@@ -0,0 +1,9 @@
+namespace AIStudio.Tools.ChatArchive;
+
+/// <summary>
+/// Describes the contents of an archive before anything is imported.
+/// </summary>
+/// <param name="Success">Whether the archive could be read.</param>
+/// <param name="Manifest">The manifest of the archive.</param>
+/// <param name="Issue">The reason why the archive could not be read, if it could not.</param>
+public sealed record ChatArchiveImportPreview(bool Success, ChatArchiveManifest Manifest, string Issue);