feat: Enhance Emulator and Rendering Performance with New Features

- Implemented a Cleanup method in the Emulator class to manage resources effectively during shutdown.
- Added auto-pause functionality to the emulator when the window loses focus, optimizing CPU and battery usage.
- Updated the DoRender method in the Controller class to include frame timing management and a gentle frame rate cap.
- Enhanced texture processing in the Arena class to batch process up to 8 texture commands per frame, improving rendering efficiency.

src/app/platform/app_delegate.mm

@@ -32,6 +32,10 @@
 
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
   [self setupMenus];
+  
+  // Disable automatic UI state persistence to prevent crashes
+  // macOS NSPersistentUIManager can crash if state gets corrupted
+  [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"NSQuitAlwaysKeepsWindows"];
 }
 
 - (void)setupMenus {