fix(widgets): drop 520px control width so expanded widgets stay in the sidebar column

WP core widgets.js applies a negative margin-left to widgets whose
control width exceeds 250px, pushing the form over the available
widgets list. Use the default width like the reference theme.

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

src/WidgetSystem/SchemaWidget.php

@@ -19,8 +19,7 @@ final class SchemaWidget extends \WP_Widget {
 				'classname'                   => 'aksrt-schema-widget aksrt-schema-widget--' . $definition->slug(),
 				'description'                 => $definition->description(),
 				'customize_selective_refresh' => true,
-			],
-			['width' => 520]
+			]
 		);
 	}