fix: remove incompatible packages from dependencies

- Remove @wordpress/url (version doesn't exist)
- Remove unused @wordpress/date and @tanstack/react-table
- Keep only core WordPress dependencies that are actually used
- Add build/ directory with compiled assets

build/admin.asset.php

@@ -0,0 +1 @@
+<?php return array('dependencies' => array('react', 'wp-components', 'wp-element', 'wp-i18n', 'wp-primitives'), 'version' => '45cbff321e1153724caa');