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/rerender-transitions.md

@@ -13,28 +13,28 @@ Mark frequent, non-urgent state updates as transitions to maintain UI responsive
 
 ```tsx
 function ScrollTracker() {
-  const [scrollY, setScrollY] = useState(0)
+  const [scrollY, setScrollY] = useState(0);
   useEffect(() => {
-    const handler = () => setScrollY(window.scrollY)
-    window.addEventListener('scroll', handler, { passive: true })
-    return () => window.removeEventListener('scroll', handler)
-  }, [])
+    const handler = () => setScrollY(window.scrollY);
+    window.addEventListener("scroll", handler, { passive: true });
+    return () => window.removeEventListener("scroll", handler);
+  }, []);
 }
 ```
 
 **Correct (non-blocking updates):**
 
 ```tsx
-import { startTransition } from 'react'
+import { startTransition } from "react";
 
 function ScrollTracker() {
-  const [scrollY, setScrollY] = useState(0)
+  const [scrollY, setScrollY] = useState(0);
   useEffect(() => {
     const handler = () => {
-      startTransition(() => setScrollY(window.scrollY))
-    }
-    window.addEventListener('scroll', handler, { passive: true })
-    return () => window.removeEventListener('scroll', handler)
-  }, [])
+      startTransition(() => setScrollY(window.scrollY));
+    };
+    window.addEventListener("scroll", handler, { passive: true });
+    return () => window.removeEventListener("scroll", handler);
+  }, []);
 }
 ```