[feat] add configuration to minimize to system tray when clicking the close button, refs #4

src/gui/tray/win_tray.h

@@ -0,0 +1,36 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2025-10-22
+ * Copyright (c) 2025 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _WIN_TRAY_H_
+#define _WIN_TRAY_H_
+
+#include <Windows.h>
+#include <shellapi.h>
+
+#include <string>
+
+#define WM_TRAY_CALLBACK (WM_USER + 1)
+
+class WinTray {
+ public:
+  WinTray(HWND app_hwnd, HICON icon, const std::wstring& tooltip,
+          int language_index);
+  ~WinTray();
+
+  void MinimizeToTray();
+  void RemoveTrayIcon();
+  bool HandleTrayMessage(MSG* msg);
+
+ private:
+  HWND app_hwnd_;
+  HWND hwnd_message_only_;
+  HICON icon_;
+  std::wstring tip_;
+  int language_index_;
+  NOTIFYICONDATA nid_;
+};
+
+#endif