refactor: rebuild desktop client with Slint

src/gui/platform/tray/mac_tray.h

@@ -7,6 +7,7 @@
 #ifndef _MAC_TRAY_H_
 #define _MAC_TRAY_H_
 
+#include <functional>
 #include <memory>
 #include <string>
 
@@ -20,6 +21,11 @@ class MacTray {
  public:
   MacTray(::SDL_Window* app_window, const std::string& tooltip,
           int language_index);
+  MacTray(std::function<void()> show_window,
+          std::function<void()> hide_window,
+          std::function<void()> open_settings,
+          std::function<void()> exit_app,
+          const std::string& tooltip, int language_index);
   ~MacTray();
 
   void MinimizeToTray();