Fix updateOrientation crash: dispatch to UI thread, add safe cast

The Android updateOrientation() set Activity.RequestedOrientation directly
from the game update thread. On Samsung OneUI (S23 Ultra) and Android 13+,
this throws CalledFromWrongThreadException because Android requires UI
property changes on the UI thread.

The iOS version correctly dispatched via InvokeOnMainThread but the
Android version was missing the equivalent RunOnUiThread wrapper.

Also replaced the unsafe direct cast (IOsuScreen)ScreenStack.CurrentScreen
with a safe pattern check (is not IOsuScreen) to handle edge cases during
initialization when CurrentScreen may not yet be an IOsuScreen.

Co-authored-by: winnerspiros <1675249+winnerspiros@users.noreply.github.com>
Agent-Logs-Url: https://github.com/winnerspiros/osu/sessions/502fe957-0685-4af6-b430-6862ca766056

Author: Copilot

osu.Android/OsuGameAndroid.cs

@@ -245,22 +245,28 @@ protected override void ScreenChanged(IOsuScreen? current, IOsuScreen? newScreen
 
         private void updateOrientation()
         {
-            var orientation = MobileUtils.GetOrientation(this, (IOsuScreen)ScreenStack.CurrentScreen, gameActivity.IsTablet);
-
-            switch (orientation)
+            gameActivity.RunOnUiThread(() =>
             {
-                case MobileUtils.Orientation.Locked:
-                    gameActivity.RequestedOrientation = ScreenOrientation.Locked;
-                    break;
+                if (ScreenStack.CurrentScreen is not IOsuScreen currentScreen)
+                    return;
 
-                case MobileUtils.Orientation.Portrait:
-                    gameActivity.RequestedOrientation = ScreenOrientation.Portrait;
-                    break;
+                var orientation = MobileUtils.GetOrientation(this, currentScreen, gameActivity.IsTablet);
 
-                case MobileUtils.Orientation.Default:
-                    gameActivity.RequestedOrientation = gameActivity.DefaultOrientation;
-                    break;
-            }
+                switch (orientation)
+                {
+                    case MobileUtils.Orientation.Locked:
+                        gameActivity.RequestedOrientation = ScreenOrientation.Locked;
+                        break;
+
+                    case MobileUtils.Orientation.Portrait:
+                        gameActivity.RequestedOrientation = ScreenOrientation.Portrait;
+                        break;
+
+                    case MobileUtils.Orientation.Default:
+                        gameActivity.RequestedOrientation = gameActivity.DefaultOrientation;
+                        break;
+                }
+            });
         }
 
         public override void SetHost(GameHost host)