Add managed plugins with lifecycle cleanup and editor extensions

web/src/themes/base.css

@@ -287,6 +287,7 @@ body {
 /* 编辑时显示在源码下方的预览 */
 .cm-rm-preview { margin: 4px 0 8px; padding: 8px 12px; border: 1px dashed var(--rm-divider); border-radius: 6px; cursor: default; }
 
+.cm-rm-code-render { display: block; padding: 8px 0; overflow-x: auto; cursor: pointer; }
 .cm-rm-mermaid { display: block; padding: 8px 0; text-align: center; overflow-x: auto; cursor: pointer; color: var(--rm-text-muted); }
 .cm-rm-mermaid svg { max-width: 100%; height: auto; }
 .cm-rm-render-error {