fix(creator-studio): render math/footnote shortcodes, inline code blocks, block deletion

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

assets/css/tinymce.css

@@ -255,7 +255,7 @@ code.gl {
 }
 
 code.gl::before {
-    content: '高亮代码';
+    content: attr(data-enlighter-language);
     position: absolute;
     right: 6px;
     top: 8px;