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/BookmarksDialog.java

@@ -88,6 +88,7 @@ public final class BookmarksDialog extends JDialog {
         if (!listModel.isEmpty()) list.setSelectedIndex(0);
         else showBookmark(null);
 
+        Dialogs.closeOnEscape(this, this::closeDialog);
         setDefaultCloseOperation(DISPOSE_ON_CLOSE);
         addWindowListener(new java.awt.event.WindowAdapter() {
             @Override