chore: Add polyfill plugin to storybook config

addons/rose/.storybook/main.js

@@ -1,3 +1,5 @@
+const namedBlockPolyfill = require('ember-named-blocks-polyfill/lib/named-blocks-polyfill-plugin');
+
 module.exports = {
   stories: [
     '../addon/components/**/*.stories.(js|mdx)',
@@ -7,5 +9,8 @@ module.exports = {
     '@storybook/addon-knobs',
     '@storybook/addon-actions',
     '@storybook/addon-docs',
-  ]
+  ],
+  emberOptions: {
+    polyfills: [namedBlockPolyfill],
+  },
 };