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/Dialogs.java

@@ -0,0 +1,44 @@
+package com.ts3client.ui;
+
+import javax.swing.AbstractAction;
+import javax.swing.JComponent;
+import javax.swing.JDialog;
+import javax.swing.JRootPane;
+import javax.swing.KeyStroke;
+import java.awt.event.ActionEvent;
+import java.awt.event.KeyEvent;
+
+/** Behaviour shared by the client's dialogs. */
+final class Dialogs {
+
+    private Dialogs() {
+    }
+
+    /**
+     * Makes Escape close a dialog, the way Swing's own option panes do.
+     *
+     * <p>The binding lives on the root pane's window-wide input map, so it fires
+     * wherever the focus sits — but only where nothing nearer to the focused
+     * component claims Escape first, which is what leaves a table's or combo
+     * box's own "cancel the edit" behaviour intact.
+     */
+    static void closeOnEscape(JDialog dialog) {
+        closeOnEscape(dialog, dialog::dispose);
+    }
+
+    /**
+     * Binds Escape to the dialog's own way of closing, for dialogs that have to
+     * tidy up (or discard edits) on the way out.
+     */
+    static void closeOnEscape(JDialog dialog, Runnable close) {
+        JRootPane root = dialog.getRootPane();
+        root.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW)
+                .put(KeyStroke.getKeyStroke(KeyEvent.VK_ESCAPE, 0), "ts3-close");
+        root.getActionMap().put("ts3-close", new AbstractAction() {
+            @Override
+            public void actionPerformed(ActionEvent e) {
+                close.run();
+            }
+        });
+    }
+}