feat(FE-Storyless): update modal functionality to use show() method and clean up code

src/components/Modal.tsx

@@ -16,7 +16,7 @@ export const useModal = () => {
 
   const openModal = useCallback(() => {
     if (!ref.current) return;
-    ref.current.showModal();
+    ref.current.show();
     setOpen(true);
   }, []);
 
@@ -30,7 +30,6 @@ export const useModal = () => {
     open ? closeModal() : openModal();
   }, [open, closeModal, openModal]);
 
-  // Gunakan useEffect agar event listener tidak didaftarkan berulang kali
   useEffect(() => {
     const dialog = ref.current;
     if (!dialog) return;