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/advanced-event-handler-refs.md

@@ -14,9 +14,9 @@ Store callbacks in refs when used in effects that shouldn't re-subscribe on call
 ```tsx
 function useWindowEvent(event: string, handler: (e) => void) {
   useEffect(() => {
-    window.addEventListener(event, handler)
-    return () => window.removeEventListener(event, handler)
-  }, [event, handler])
+    window.addEventListener(event, handler);
+    return () => window.removeEventListener(event, handler);
+  }, [event, handler]);
 }
 ```
 
@@ -24,31 +24,31 @@ function useWindowEvent(event: string, handler: (e) => void) {
 
 ```tsx
 function useWindowEvent(event: string, handler: (e) => void) {
-  const handlerRef = useRef(handler)
+  const handlerRef = useRef(handler);
   useEffect(() => {
-    handlerRef.current = handler
-  }, [handler])
+    handlerRef.current = handler;
+  }, [handler]);
 
   useEffect(() => {
-    const listener = (e) => handlerRef.current(e)
-    window.addEventListener(event, listener)
-    return () => window.removeEventListener(event, listener)
-  }, [event])
+    const listener = (e) => handlerRef.current(e);
+    window.addEventListener(event, listener);
+    return () => window.removeEventListener(event, listener);
+  }, [event]);
 }
 ```
 
 **Alternative: use `useEffectEvent` if you're on latest React:**
 
 ```tsx
-import { useEffectEvent } from 'react'
+import { useEffectEvent } from "react";
 
 function useWindowEvent(event: string, handler: (e) => void) {
-  const onEvent = useEffectEvent(handler)
+  const onEvent = useEffectEvent(handler);
 
   useEffect(() => {
-    window.addEventListener(event, onEvent)
-    return () => window.removeEventListener(event, onEvent)
-  }, [event])
+    window.addEventListener(event, onEvent);
+    return () => window.removeEventListener(event, onEvent);
+  }, [event]);
 }
 ```