Use heap allocation for WindowMessageDispatcher singleton

Changed WindowMessageDispatcher::GetInstance to allocate the singleton instance on the heap. This avoids issues with static destruction order and ensures the instance remains valid throughout the program lifetime, including during static destruction.

Author: lijy91

src/platform/windows/window_message_dispatcher.cpp

@@ -5,8 +5,11 @@
 namespace nativeapi {
 
 WindowMessageDispatcher& WindowMessageDispatcher::GetInstance() {
-  static WindowMessageDispatcher instance;
-  return instance;
+  // Use heap allocation to avoid static destruction order issues
+  // The instance is never destroyed to ensure it remains valid during
+  // the entire program lifetime, including during static destruction
+  static auto* instance = new WindowMessageDispatcher();
+  return *instance;
 }
 
 WindowMessageDispatcher::~WindowMessageDispatcher() {