Added profile, provider, and workspace preselection to chat templates (#1099)

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

app/MindWork AI Studio/Tools/Services/ChatLauncherProfileResult.cs

@@ -0,0 +1,10 @@
+using AIStudio.Settings;
+
+namespace AIStudio.Tools.Services;
+
+/// <summary>
+/// The profile a chat started by an assistant chat launcher begins with.
+/// </summary>
+/// <param name="Profile">The profile of the chat, or null when the profile the launcher names does not exist.</param>
+/// <param name="ErrorMessage">Why no profile could be chosen, or an empty string when one was.</param>
+internal readonly record struct ChatLauncherProfileResult(Profile? Profile, string ErrorMessage);