Add GUI scale sliders for Saturn's screens

The title screen, the menus and the HUD menus (emote wheel, shift menu)
each get a scale slider, relative to Minecraft's GUI scale. The HUD
editor stays in GUI pixels.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/main/java/org/saturnclient/ui/screens/TitleMenu.java

@@ -6,6 +6,7 @@ import org.saturnclient.common.provider.Providers;
 import org.saturnclient.common.ref.game.MinecraftClientRef.MinecraftScreen;
 import org.saturnclient.config.AnimationConfig;
 import org.saturnclient.config.Config;
+import org.saturnclient.config.property.FloatProperty;
 import org.saturnclient.config.Theme;
 import org.saturnclient.ui.Element;
 import org.saturnclient.ui.SaturnScreen;
@@ -39,6 +40,11 @@ public class TitleMenu extends SaturnScreen {
         super("Title Menu");
     }
 
+    @Override
+    protected FloatProperty getScaleSetting() {
+        return Config.titleScale;
+    }
+
     @Override
     public void ui() {
         blurBackground = false;