feat: add storybook global decorator

Author: eunnbi

.storybook/main.ts

@@ -1,4 +1,5 @@
 import path from 'path';
+
 import type { StorybookConfig } from '@storybook/nextjs';
 
 const config: StorybookConfig = {

.storybook/preview.ts .storybook/preview.tsx

@@ -1,5 +1,8 @@
 import '../src/app/index.css';
 
+import React from 'react';
+import { Toaster } from 'sonner';
+
 import type { Preview } from '@storybook/react';
 
 const preview: Preview = {
@@ -11,6 +14,14 @@ const preview: Preview = {
       },
     },
   },
+  decorators: [
+    (Story) => (
+      <>
+        <Story />
+        <Toaster />
+      </>
+    ),
+  ],
 };
 
 export default preview;