feat: add delayed scene destruction to prevent null references

src/core/GameApplication.cpp

@@ -102,5 +102,10 @@ void GameApplication::run() {
     m_windowManager->endUI();
 
     m_windowManager->Present();
+    cleanup();
 }
 
+
+void GameApplication::cleanup() {
+    m_sceneManager->destoryQuitedScene();
+}

src/core/GameApplication.h

@@ -22,7 +22,7 @@ private:
     std::unique_ptr<UIRenderer> m_uiRenderer;
     std::unique_ptr<DebugManager> m_debugManager;
     Config m_config;
-   
+    void cleanup();
 
 public:
     GameApplication();