Fix license headers

src/Eden/Interface/MainWindowInterface.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #include "Eden/Models/GameListModel.h"
 #include "MainWindowInterface.h"
 #include "frontend_common/content_manager.h"

src/Eden/Interface/MainWindowInterface.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #pragma once
 
 #include <QObject>

src/qt_common/abstract/frontend.cpp

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 #include "frontend.h"
 
 namespace QtCommon::Frontend {