feat(ui): Enhance AppClickUserData management for proper cleanup and tracking

main/ui/ui_handler.h

@@ -7,6 +7,7 @@
 #include "ui/interaction_handler.h"
 #include "lvgl.h"
 #include <memory>
+#include <vector>
 
 /**
  * @brief UI Handler - manages app lifecycle and rendering
@@ -115,4 +116,7 @@ private:
   lv_obj_t* main_screen_ = nullptr;    ///< Root screen
   RootLayout root_layout_;            ///< Main screen layout manager
   AppDescriptor* active_descriptor_ = nullptr;  ///< Currently active app descriptor (managed by AppRegistry)
+  
+  // Track allocated user data for cleanup
+  std::vector<void*> app_click_user_data_;
 };