button switch with arrows

src/main/java/cz/kamma/kfmanager/MainApp.java

@@ -3,6 +3,9 @@ package cz.kamma.kfmanager;
 import cz.kamma.kfmanager.ui.MainWindow;
 
 import javax.swing.*;
+import java.awt.*;
+import java.awt.event.AWTEventListener;
+import java.awt.event.KeyEvent;
 
 /**
  * Main application class for KF File Manager
@@ -22,10 +25,48 @@ public class MainApp {
             e.printStackTrace();
         }
 
+        // Enable arrow key navigation in JOptionPane dialogs
+        setupGlobalKeyNavigation();
+        
         // Start GUI in Event Dispatch Thread
         SwingUtilities.invokeLater(() -> {
             MainWindow mainWindow = new MainWindow();
             mainWindow.setVisible(true);
         });
     }
+
+    private static void setupGlobalKeyNavigation() {
+        Toolkit.getDefaultToolkit().addAWTEventListener(event -> {
+            if (event instanceof KeyEvent) {
+                KeyEvent ke = (KeyEvent) event;
+                if (ke.getID() == KeyEvent.KEY_PRESSED) {
+                    int code = ke.getKeyCode();
+                    if (code == KeyEvent.VK_LEFT || code == KeyEvent.VK_RIGHT) {
+                        Component focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
+                        if (focusOwner instanceof JButton) {
+                            if (isInsideJOptionPane(focusOwner)) {
+                                if (code == KeyEvent.VK_LEFT) {
+                                    focusOwner.transferFocusBackward();
+                                } else {
+                                    focusOwner.transferFocus();
+                                }
+                                ke.consume();
+                            }
+                        }
+                    }
+                }
+            }
+        }, AWTEvent.KEY_EVENT_MASK);
+    }
+
+    private static boolean isInsideJOptionPane(Component c) {
+        Component parent = c;
+        while (parent != null) {
+            if (parent instanceof JOptionPane) {
+                return true;
+            }
+            parent = parent.getParent();
+        }
+        return false;
+    }
 }