fix missing ts block, add some drafts.

Author: Jaxkr

docs/guide/user-interface.mdx

@@ -237,6 +237,7 @@ The stylesheet MUST be in the assets folder.
 
 For more readable and scoped component styles:
 
+```ts
 render() {
   const styles = `
     .box {
@@ -262,6 +263,7 @@ render() {
     </div>
   );
 }
+```
 
 ---