Fix RCTAppearance setColorScheme crashing CarPlay apps (non-UIWindowScene guard)

[SnowingFox]

Summary:

Fixes #57863

RCTAppearance setColorScheme: (also reached via Appearance.setColorScheme() and setUserInterfaceStyle) iterates RCTSharedApplication().connectedScenes and reads scene.windows on every scene. connectedScenes contains UIScene objects of any class, and a CarPlay CPTemplateApplicationScene is a UIScene that does not implement windows, so the message send raises -[CPTemplateApplicationScene windows]: unrecognized selector and the app aborts.

Fix: guard each scene with isKindOfClass:[UIWindowScene class] and skip non-UIWindowScene objects before touching .windows, mirroring the existing pattern already used in RCTUtils.mm (if (![scene isKindOfClass:[UIWindowScene class]]) { continue; }).

Note: RCTDevMenu.mm showOnShake has the same unguarded for (UIWindowScene *scene ...) loop and would crash identically in a CarPlay context; left untouched here to keep this fix minimal, but it should get the same guard.

Changelog:

[IOS] [FIXED] - RCTAppearance.setColorScheme() no longer crashes CarPlay apps when connectedScenes contains a non-UIWindowScene

Test Plan:

No jest path exists for this code: it is Objective-C, iOS-only, and iOS cannot be built in the Linux environment this PR was developed in. Correctness is by code inspection.

Commands run (in the branch worktree):

• git diff packages/react-native/React/CoreModules/RCTAppearance.mm — confirms the only change is the 3-line guard:

  for (UIWindowScene *scene in RCTSharedApplication().connectedScenes) {
+   if (![scene isKindOfClass:[UIWindowScene class]]) {
+     continue;
+   }
    [windows addObjectsFromArray:scene.windows];
  }

• Code inspection of the edited region in full:

- (void)setColorScheme:(NSString *)style
{
  UIUserInterfaceStyle userInterfaceStyle = [RCTConvert UIUserInterfaceStyle:style];
  NSMutableArray<UIWindow *> *windows = [NSMutableArray new];
  for (UIWindowScene *scene in RCTSharedApplication().connectedScenes) {
    if (![scene isKindOfClass:[UIWindowScene class]]) {
      continue;
    }
    [windows addObjectsFromArray:scene.windows];
  }

  for (UIWindow *window in windows) {
    window.overrideUserInterfaceStyle = userInterfaceStyle;
  }
}

The guard makes setColorScheme tolerate any non-UIWindowScene object in connectedScenes by skipping it before the .windows message send. isKindOfClass: is safe to send to any UIScene (all are NSObject-derived), so the previously-crashing path is unreachable for CarPlay scenes.

This matches the reporter's production patch-package fix that has been field-tested on-device since 2026-08-02.

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