feat: add arrow key navigation to calculator sample

samples/calc-02/index.js

@@ -316,6 +316,17 @@ function handleKeyboard(event) {
 		'%': 'mod',
 		'^': 'pow',
 	};
+	const arrowMap = {
+		ArrowUp: upButton,
+		ArrowDown: downButton,
+		ArrowLeft: leftButton,
+		ArrowRight: rightButton,
+	};
+	if (arrowMap[key]) {
+		event.preventDefault();
+		arrowMap[key].click();
+		return;
+	}
 	if (map[key]) {
 		event.preventDefault();
 		execute(map[key]);