Add Qt-only autosave recovery fallback

Provide a small KAutoSaveFile-compatible implementation for the no-KF5 build path and use it to keep the existing crash-recovery code active when BUILD_WITH_KF5=OFF.

The normal KF5 build still uses the KDE KAutoSaveFile implementation.

Assisted-by: pi coding agent / Mika (OpenAI GPT-5.5)

sources/qetdiagrameditor.cpp

@@ -49,6 +49,7 @@
 #include "ui/terminalnumberingdialog.h"
 #include <QDebug>
 #ifdef BUILD_WITHOUT_KF5
+#	include "ui/nokde/kautosavefile.h"
 #else
 #	include <KAutoSaveFile>
 #endif
@@ -1948,8 +1949,6 @@ bool QETDiagramEditor::drawGrid() const
 	return m_draw_grid->isChecked();
 }
 
-#ifdef BUILD_WITHOUT_KF5
-#else
 /**
 	@brief QETDiagramEditor::openBackupFiles
 	@param backup_files
@@ -1980,7 +1979,6 @@ void QETDiagramEditor::openBackupFiles(QList<KAutoSaveFile *> backup_files)
 		DialogWaiting::dropInstance();
 	}
 }
-#endif
 /**
 	met a jour le menu "Fenetres"
 */