[iOS] RCTLogBoxView crashes on dealloc when app uses SceneDelegate because it still assumes AppDelegate.window exists

Description

When using a SceneDelegate-based iOS app lifecycle, React Native crashes in RCTLogBoxView during deallocation because it still accesses RCTSharedApplication().delegate.window.

The following code in RCTLogBoxView is problematic:

- (void)dealloc
{
#if !TARGET_OS_MACCATALYST // sharedApplication.delegate is not available on Mac Catalyst
  [RCTSharedApplication().delegate.window makeKeyWindow];
#endif
}

In a SceneDelegate setup, the app’s main window is typically owned by the active UIWindowScene, not exposed as AppDelegate.window. As a result, this code can crash with an unrecognized selector / invalid access depending on how the app delegate is implemented.

This looks like the same broader class of SceneDelegate compatibility issues as other places in React Native that still assume application.delegate.window exists.

Steps to reproduce

1. Create a React Native app on iOS
2. Adopt SceneDelegate / UIScene lifecycle
3. Ensure the app delegate does not expose a window property
4. Trigger LogBox presentation and dismissal / teardown in development
5. Observe crash when RCTLogBoxView is deallocated

React Native Version

0.83.0

Output of npx @react-native-community/cli info

npx @react-native-community/cli info

Screenshots and Videos

RCTLogBoxView

• (void)dealloc
  {

#if !TARGET_OS_MACCATALYST

[RCTSharedApplication().delegate.window makeKeyWindow];

#endif

}

Bắt đầu bằng cách xác định RCTLogBoxView và đọc implementation dealloc của nó, đặc biệt là việc truy cập RCTSharedApplication().delegate.window. Tái hiện luồng teardown với một app dựa trên SceneDelegate, sau đó xác minh rằng việc dismiss và deallocation LogBox không còn gây crash trong khi hành vi hiện tại vẫn được giữ nguyên.