Refresh player with native block editor preview and local assets

Preserve shortcode rendering, normalize options, bundle the player locally,
and add reproducible packaging and WordPress integration tests.

.gitignore

@@ -48,4 +48,9 @@ wp-config.php
 #/wp-content/themes
 
 .idea/
-dist/
+dist/
+/node_modules/
+/build/
+/playwright-report/
+/test-results/
+/.wp-env/