jfjoch_viewer: Show detected GPUs in the about box

viewer/JFJochViewerMenu.cpp

@@ -15,6 +15,7 @@
 
 #include "JFJochViewerWindow.h"
 #include "../common/GitInfo.h"
+#include "../common/CUDAWrapper.h"
 
 JFJochViewerMenu::JFJochViewerMenu(QWidget *parent) : QMenuBar(parent) {
     // Create "File" menu
@@ -85,15 +86,21 @@ void JFJochViewerMenu::aboutSelected() {
     QMessageBox aboutBox(this);
     aboutBox.setWindowTitle("About");
 
-    // Set detailed text with proper spacing and structure
-    aboutBox.setText(
-        "<h3>Jungfraujoch Image Viewer</h3>" // Use HTML for improved style
+    QString about_text = "<h3>Jungfraujoch Image Viewer</h3>" // Use HTML for improved style
         "<p><b>Version:</b> " + version + "</p>"
         "<p><b>Copyright:</b> 2019-2025 Paul Scherrer Institute</p>"
         "<p><b>Author:</b> Filip Leonarski &lt;filip.leonarski@psi.ch&gt;</p>"
         "<p><b>Links:</b> <a href='https://jungfraujoch.readthedocs.io'>Documentation</a>, "
-       "<a href='https://gitea.psi.ch/mx/jungfraujoch'>Repository</a></p>"
-    );
+       "<a href='https://gitea.psi.ch/mx/jungfraujoch'>Repository</a></p>";
+
+#ifdef JFJOCH_USE_CUDA
+    about_text += QString("<p>Compiled with CUDA support. %1 GPU(s) detected</p>")
+    .arg(QString::number(get_gpu_count()));
+#else
+    about_text += "<p><b>Note:</b> CUDA is not available on this system.</p>";
+#endif
+    // Set detailed text with proper spacing and structure
+    aboutBox.setText(about_text);
 
     // Optional: Add a larger informative text, if needed
     aboutBox.setInformativeText(