Close the client's dialogs with Escape

Only the option-pane prompts closed on Escape, because Swing installs
that binding on the option pane itself. Dialogs.closeOnEscape puts the
same window-wide binding on a dialog's root pane, routed to whatever
that dialog does when its Close or Cancel button is pressed — reverting
the live-previewing settings, or flushing the bookmark being edited.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

ts3-client/swing/src/main/java/com/ts3client/ui/SettingsDialog.java

@@ -116,11 +116,7 @@ public final class SettingsDialog extends JDialog {
             apply();
             close();
         });
-        cancel.addActionListener(e -> {
-            notificationsPanel.revert();
-            iconPackPanel.revert();
-            close();
-        });
+        cancel.addActionListener(e -> cancel());
         right.add(ok);
         right.add(cancel);
         buttons.add(right, BorderLayout.EAST);
@@ -129,6 +125,7 @@ public final class SettingsDialog extends JDialog {
         getContentPane().add(tabs, BorderLayout.CENTER);
         getContentPane().add(buttons, BorderLayout.SOUTH);
 
+        Dialogs.closeOnEscape(this, this::cancel);
         setDefaultCloseOperation(DISPOSE_ON_CLOSE);
         addWindowListener(new java.awt.event.WindowAdapter() {
             @Override
@@ -576,6 +573,13 @@ public final class SettingsDialog extends JDialog {
         if (onApply != null) onApply.run();
     }
 
+    /** Leaves without applying, putting back the settings that preview themselves live. */
+    private void cancel() {
+        notificationsPanel.revert();
+        iconPackPanel.revert();
+        close();
+    }
+
     private void close() {
         stopMeter();
         dispose();