feat(creator-studio): icon toolbar with block tools, drop author strip

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

functions.php

@@ -324,6 +324,9 @@ if (class_exists('\Jio\Core\CreatorRest')) {
 if (class_exists('\Jio\Core\CreatorStudio')) {
     \Jio\Core\CreatorStudio::get_instance()->init();
 }
+if (class_exists('\Jio\Content\ContentBlocks')) {
+    \Jio\Content\ContentBlocks::get_instance()->init();
+}
 if (class_exists('\Jio\Content\PrivateAssets')) {
     \Jio\Content\PrivateAssets::get_instance()->init();
 }