feat: replace calculator enter key label with symbol

samples/calc-02/index.js

@@ -30,7 +30,7 @@ const calculatorEl = document.querySelector('.calculator');
 const statusLine = document.getElementById('statusLine');
 
 const keypadKeys = [
-	{ label: 'ENTER', action: 'enter', className: 'key-enter' },
+	{ label: '⏎', action: 'enter', className: 'key-enter' },
 	{ label: '⎋', action: 'escape', className: 'key-escape' },
 	{ label: 'C', action: 'clear', className: 'key-danger' },
 	{ label: '⌫', action: 'backspace', className: 'key-danger' },