fix(android): Prevent startup crash by robustly loading rulesets and native libs - #87

• Wrapped native library loading (osu.Android.Native) in a try-catch block within OsuGameActivity.OnCreate. This prevents the application from crashing immediately if the native library (containing Oboe/Vulkan drivers) fails to load (e.g., UnsatisfiedLinkError). The app can now proceed, and specific drivers will gracefully fail later if enabled.
• Hardened Ruleset Loading: Replaced string-based Assembly.Load("...") with Assembly.Load(typeof(...).Assembly.FullName) wrapped in try-catch.
  • Linker Safety: Using typeof() creates a strong static reference to the ruleset types (OsuRuleset, TaikoRuleset, etc.), ensuring the Xamarin/Android linker does not strip these assemblies in Release builds. This is a common cause of "crash on startup" in deployed APKs.
  • Error Handling: Added logging to capture and non-fatally handle any issues during ruleset preloading.
• Added Defensive Null Checks: Inserted runtime null checks for Window, WindowManager, and Resources in OnCreate before accessing their properties, replacing Debug.Assert which is removed in Release builds.
• Async Safety: Wrapped the handleImportFromUris async task body in a try-catch block to prevent unobserved task exceptions from crashing the process.

These changes collectively address the reported "crash on open" issue on the S23 Ultra by handling the most likely causes: stripped assemblies and native library loading failures.

PR created automatically by Jules for task 8348821197718379664 started by @winnerspiros