added f9 terminal

src/main/java/com/kfmanager/ui/MainWindow.java

@@ -240,7 +240,7 @@ public class MainWindow extends JFrame {
      * Create button panel (like Total Commander)
      */
     private void createButtonPanel() {
-        buttonPanel = new JPanel(new GridLayout(1, 8, 5, 5));
+        buttonPanel = new JPanel(new GridLayout(1, 9, 5, 5));
         buttonPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
         
     JButton btnView = new JButton("F3 View");
@@ -261,6 +261,9 @@ public class MainWindow extends JFrame {
     JButton btnDelete = new JButton("F8 Delete");
         btnDelete.addActionListener(e -> deleteFiles());
         
+    JButton btnTerminal = new JButton("F9 Terminal");
+        btnTerminal.addActionListener(e -> openTerminal());
+        
     JButton btnRename = new JButton("Shift+F6 Rename");
         btnRename.addActionListener(e -> renameFile());
         
@@ -273,6 +276,7 @@ public class MainWindow extends JFrame {
         buttonPanel.add(btnMove);
         buttonPanel.add(btnNewDir);
         buttonPanel.add(btnDelete);
+        buttonPanel.add(btnTerminal);
         buttonPanel.add(btnRename);
         buttonPanel.add(btnExit);
     }
@@ -482,6 +486,11 @@ public class MainWindow extends JFrame {
                 KeyStroke.getKeyStroke(KeyEvent.VK_F8, 0),
                 JComponent.WHEN_IN_FOCUSED_WINDOW);
 
+    // F9 - Open terminal
+        rootPane.registerKeyboardAction(e -> openTerminal(),
+                KeyStroke.getKeyStroke(KeyEvent.VK_F9, 0),
+                JComponent.WHEN_IN_FOCUSED_WINDOW);
+
     // Delete key - global delete binding (also added per-table)
     rootPane.registerKeyboardAction(e -> deleteFiles(),
         KeyStroke.getKeyStroke(KeyEvent.VK_DELETE, 0),
@@ -1038,6 +1047,60 @@ public class MainWindow extends JFrame {
         }
     }
     
+    /**
+     * Open terminal in the current directory
+     */
+    private void openTerminal() {
+        File currentDir = activePanel.getCurrentDirectory();
+        if (currentDir == null) {
+            currentDir = new File(System.getProperty("user.home"));
+        }
+        
+        try {
+            String osName = System.getProperty("os.name").toLowerCase();
+            ProcessBuilder pb;
+            
+            if (osName.contains("win")) {
+                // Windows
+                pb = new ProcessBuilder("cmd.exe", "/c", "start", "cmd.exe");
+            } else if (osName.contains("mac")) {
+                // macOS
+                pb = new ProcessBuilder("open", "-a", "Terminal", currentDir.getAbsolutePath());
+            } else {
+                // Linux and other Unix-like systems
+                // Try common terminal emulators
+                String[] terminals = {"gnome-terminal", "xterm", "konsole", "xfce4-terminal", "mate-terminal"};
+                pb = null;
+                
+                for (String terminal : terminals) {
+                    try {
+                        Process p = Runtime.getRuntime().exec(new String[]{"which", terminal});
+                        if (p.waitFor() == 0) {
+                            pb = new ProcessBuilder(terminal);
+                            break;
+                        }
+                    } catch (Exception e) {
+                        // Try next terminal
+                    }
+                }
+                
+                if (pb == null) {
+                    // Fallback to xterm if nothing else works
+                    pb = new ProcessBuilder("xterm");
+                }
+            }
+            
+            pb.directory(currentDir);
+            pb.start();
+            
+        } catch (Exception e) {
+            JOptionPane.showMessageDialog(this,
+                    "Chyba při otevírání terminálu: " + e.getMessage(),
+                    "Chyba",
+                    JOptionPane.ERROR_MESSAGE);
+        }
+    }
+
     /**
      * Show About dialog
      */
@@ -1053,7 +1116,8 @@ public class MainWindow extends JFrame {
             "F6 - Move\n" +
             "F7 - New directory\n" +
             "F8 - Delete\n" +
-            "F9 / Shift+F6 - Rename\n" +
+            "F9 - Open terminal\n" +
+            "Shift+F6 - Rename\n" +
             "TAB - Switch panel\n" +
             "Ctrl+F - Search\n" +
             "Alt+O - Settings\n" +