remove dead code

src/hooks/use-data-state.tsx

@@ -1,52 +0,0 @@
-import * as React from "react";
-
-type DataStateValue = string | boolean | null;
-
-function parseDatasetValue(value: string | null): DataStateValue {
-	if (value === null) return null;
-	if (value === "" || value === "true") return true;
-	if (value === "false") return false;
-	return value;
-}
-
-function useDataState<T extends HTMLElement = HTMLElement>(
-	key: string,
-	forwardedRef?: React.Ref<T | null>,
-	onChange?: (value: DataStateValue) => void,
-): [DataStateValue, React.RefObject<T | null>] {
-	const localRef = React.useRef<T | null>(null);
-	React.useImperativeHandle(forwardedRef, () => localRef.current as T);
-
-	const getSnapshot = (): DataStateValue => {
-		const el = localRef.current;
-		return el ? parseDatasetValue(el.getAttribute(`data-${key}`)) : null;
-	};
-
-	const subscribe = (callback: () => void) => {
-		const el = localRef.current;
-		if (!el) return () => {};
-		const observer = new MutationObserver((records) => {
-			for (const record of records) {
-				if (record.attributeName === `data-${key}`) {
-					callback();
-					break;
-				}
-			}
-		});
-		observer.observe(el, {
-			attributes: true,
-			attributeFilter: [`data-${key}`],
-		});
-		return () => observer.disconnect();
-	};
-
-	const value = React.useSyncExternalStore(subscribe, getSnapshot);
-
-	React.useEffect(() => {
-		if (onChange) onChange(value);
-	}, [value, onChange]);
-
-	return [value, localRef];
-}
-
-export { useDataState };