fix: resolve Prettier markdown code block parsing errors

- Fix syntax errors in skills markdown files (.github/skills, .opencode/skills)
- Change typescript to tsx for code blocks with JSX
- Replace ellipsis (...) in array examples with valid syntax
- Separate CSS from TypeScript into distinct code blocks
- Convert JavaScript object examples to valid JSON in docs
- Fix enum definitions with proper comma separation

.opencode/skills/vercel-react-best-practices/rules/rendering-content-visibility.md

@@ -24,14 +24,14 @@ Apply `content-visibility: auto` to defer off-screen rendering.
 function MessageList({ messages }: { messages: Message[] }) {
   return (
     <div className="overflow-y-auto h-screen">
-      {messages.map(msg => (
+      {messages.map((msg) => (
         <div key={msg.id} className="message-item">
           <Avatar user={msg.author} />
           <div>{msg.content}</div>
         </div>
       ))}
     </div>
-  )
+  );
 }
 ```