Added a setting to change the size of the interface (#1136)

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

app/MindWork AI Studio/Settings/DataModel/InterfaceSize.cs

@@ -0,0 +1,24 @@
+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// How large AI Studio shows its interface on a screen.
+/// </summary>
+public enum InterfaceSize
+{
+    /// <summary>
+    /// The same size on every laptop, whatever the scaling of its system. The default on the screen
+    /// of a laptop. Larger screens, such as external monitors, and screens which do not report their
+    /// size keep the scaling of the system with it.
+    /// </summary>
+    APP_DEFAULT,
+
+    /// <summary>
+    /// The scaling of the system, unchanged. The default on any screen but the one of a laptop.
+    /// </summary>
+    SYSTEM_SCALING,
+
+    /// <summary>
+    /// A scale of the user's own, see InterfaceScreenSize.CustomPercent.
+    /// </summary>
+    CUSTOM,
+}