feat: show completed checkout alert

packages/web/src/components/CheckoutCompletedAlert/index.ee.tsx

@@ -0,0 +1,30 @@
+import * as React from 'react';
+import { useLocation } from 'react-router-dom';
+import Alert from '@mui/material/Alert';
+import Typography from '@mui/material/Typography';
+
+import useFormatMessage from 'hooks/useFormatMessage';
+
+export default function CheckoutCompletedAlert() {
+  const formatMessage = useFormatMessage();
+  const location = useLocation();
+  const state = location.state as { checkoutCompleted: boolean };
+
+  const checkoutCompleted = state?.checkoutCompleted;
+
+  if (!checkoutCompleted) return <React.Fragment />;
+
+  return (
+    <Alert
+      severity="success"
+      sx={{
+        display: 'flex',
+        alignItems: 'center',
+      }}
+    >
+      <Typography variant="subtitle2" sx={{ lineHeight: 1.5 }}>
+        {formatMessage('checkoutCompletedAlert.text')}
+      </Typography>
+    </Alert>
+  );
+}