Fix Android startup crash: guard native bridge type loading and protect Battery API

- Guard stopOboeBridge()/stopVulkanProbe() calls with nativeBridges != null
  check to prevent JIT compilation of [NoInlining] helpers during the
  initial false→false callback, which would otherwise trigger type loading
  of AndroidNativeBridgeManager (and potentially cascade to native P/Invoke
  types on Samsung devices).

- Guard disposeNativeBridges() in Dispose with the same null check.

- Wrap AndroidBatteryInfo.ChargeLevel and OnBattery in try-catch to prevent
  MAUI Essentials Battery API crashes on Samsung devices with aggressive
  battery optimization.

Agent-Logs-Url: https://github.com/winnerspiros/osu/sessions/7246c167-0b69-48a2-9b47-0771fe6d1e63

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

Author: Copilot

osu.Android/OsuGameAndroid.cs

@@ -139,7 +139,7 @@ protected override void LoadComplete()
                             Debug.WriteLine($"[osu!] Audio offset auto-suggested: {suggested:F1}ms (hardware latency={latency:F1}ms)");
                         });
                     }
-                    else
+                    else if (nativeBridges != null)
                     {
                         stopOboeBridge();
                     }
@@ -156,7 +156,7 @@ protected override void LoadComplete()
                 {
                     if (e.NewValue)
                         startVulkanProbe();
-                    else
+                    else if (nativeBridges != null)
                         stopVulkanProbe();
                 }
                 catch (Exception ex)
@@ -358,15 +358,42 @@ protected override void Dispose(bool isDisposing)
             }
             finally
             {
-                disposeNativeBridges();
+                if (nativeBridges != null)
+                    disposeNativeBridges();
             }
         }
 
         private class AndroidBatteryInfo : BatteryInfo
         {
-            public override double? ChargeLevel => Battery.ChargeLevel;
+            public override double? ChargeLevel
+            {
+                get
+                {
+                    try
+                    {
+                        return Battery.ChargeLevel;
+                    }
+                    catch
+                    {
+                        return null;
+                    }
+                }
+            }
 
-            public override bool OnBattery => Battery.PowerSource == BatteryPowerSource.Battery;
+            public override bool OnBattery
+            {
+                get
+                {
+                    try
+                    {
+                        return Battery.PowerSource == BatteryPowerSource.Battery;
+                    }
+                    catch
+                    {
+                        return false;
+                    }
+                }
+            }
         }
     }
 }