fix(widgets): disable block widget editor to restore classic widgets screen

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

src/WidgetSystem/Runtime.php

@@ -16,6 +16,10 @@ final class Runtime {
 		}
 		self::$registered = true;
 
+		// Reference theme manages widgets on the classic screen; the block widget editor bypasses every schema form.
+		add_filter('gutenberg_use_widgets_block_editor', '__return_false');
+		add_filter('use_widgets_block_editor', '__return_false');
+
 		add_action('widgets_init', [self::class, 'unregister_core_widgets'], 1);
 		add_action('widgets_init', [WidgetAreas::class, 'register'], 5);
 		add_action('widgets_init', [self::class, 'register_widgets'], 10);