fix: debounce URL updates to prevent History API errors

mapper/src/App.js

@@ -294,11 +294,17 @@ function App() {
 	const [slider, setSlider] = useState(initialSlider);
 
 	useEffect(() => {
+		const handler = setTimeout(() => {
 			const params = new URLSearchParams();
 			params.set('duration', duration.id);
 			params.set('end', end.unix());
 			params.set('slider', slider.join(','));
 			window.history.replaceState({}, '', `${window.location.pathname}?${params.toString()}`);
+		}, 500);
+
+		return () => {
+			clearTimeout(handler);
+		};
 	}, [duration, end, slider]);
 
 	return (