[chore] standardize source file headers

apps/desktop/src/gui/application/server_window_state.h

@@ -1,4 +1,11 @@
-#pragma once
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-09-04
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _SERVER_WINDOW_STATE_H_
+#define _SERVER_WINDOW_STATE_H_
 
 #include <algorithm>
 #include <iterator>
@@ -24,5 +31,6 @@ inline int ReconcileSelectedController(const std::vector<std::string>& ids,
   }
   return static_cast<int>(std::distance(ids.begin(), selected));
 }
+} // namespace crossdesk::server_window_state
 
-}  // namespace crossdesk::server_window_state
+#endif