Use safe pattern-match cast in native bridge helpers per code review

Agent-Logs-Url: https://github.com/winnerspiros/osu/sessions/95598d2f-be81-4823-9192-311690d7d7f2

Co-authored-by: winnerspiros <1675249+winnerspiros@users.noreply.github.com>

Author: Copilot

osu.Android/OsuGameAndroid.cs

@@ -255,7 +255,9 @@ public double GetMeasuredAudioLatencyMs()
         private void startOboeBridge(Action<double> onLatencyMeasured)
         {
             nativeBridges ??= new AndroidNativeBridgeManager();
-            ((AndroidNativeBridgeManager)nativeBridges).StartOboeBridge(Scheduler, onLatencyMeasured);
+
+            if (nativeBridges is AndroidNativeBridgeManager mgr)
+                mgr.StartOboeBridge(Scheduler, onLatencyMeasured);
         }
 
         [MethodImpl(MethodImplOptions.NoInlining)]
@@ -268,7 +270,9 @@ private void stopOboeBridge()
         private void startVulkanProbe()
         {
             nativeBridges ??= new AndroidNativeBridgeManager();
-            ((AndroidNativeBridgeManager)nativeBridges).StartVulkanProbe();
+
+            if (nativeBridges is AndroidNativeBridgeManager mgr)
+                mgr.StartVulkanProbe();
         }
 
         [MethodImpl(MethodImplOptions.NoInlining)]