Defer window show hook to next runloop on macOS

The original makeKeyAndOrderFront implementation is now deferred to the next runloop turn to ensure the Dart hook runs first. An associated flag prevents multiple schedules for the same call, improving hook reliability.

Author: lijy91

src/platform/macos/window_manager_macos.mm

@@ -48,8 +48,21 @@ @implementation NSWindow (NativeAPISwizzle)
 - (void)na_swizzled_makeKeyAndOrderFront:(id)sender {
   // Invoke hook before showing
   nativeapi::WindowManager::GetInstance().InvokeWillShowHook([self windowNumber]);
-  // Call original implementation (swapped)
-  [self na_swizzled_makeKeyAndOrderFront:sender];
+
+  // Defer calling original to the next runloop turn so Dart hook can run first
+  // Guard with associated flag to avoid multiple schedules for the same call
+  static const void* kNAWillShowScheduledKey = &kNAWillShowScheduledKey;
+  id scheduled = objc_getAssociatedObject(self, kNAWillShowScheduledKey);
+  if (!scheduled) {
+    objc_setAssociatedObject(self, kNAWillShowScheduledKey, @YES,
+                             OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    dispatch_async(dispatch_get_main_queue(), ^{
+      // Clear flag
+      objc_setAssociatedObject(self, kNAWillShowScheduledKey, nil, OBJC_ASSOCIATION_ASSIGN);
+      // Call original implementation (swapped)
+      [self na_swizzled_makeKeyAndOrderFront:sender];
+    });
+  }
 }
 
 - (void)na_swizzled_orderOut:(id)sender {