fix: resolve React 19 TypeScript compatibility in modernjs package

- Fix useRef() call to provide initial value for React 19 compatibility
- Resolves 'Expected 1 arguments, but got 0' TypeScript error
- Ensures all 35 packages build successfully

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: ScriptedAlchemy

packages/modernjs/src/runtime/AwaitDataFetch.tsx

@@ -83,7 +83,7 @@ export function AwaitDataFetch<T>({
   children,
   params,
 }: AwaitProps<T>) {
-  const dataRef = useRef<T>();
+  const dataRef = useRef<T | undefined>(undefined);
   const data = dataRef.current || resolve;
   const getData = isPromise(data) ? fetchData(data, dataRef) : () => data;