perf: enable uno autoimport in storybook

Author: alexdln

nuxt.config.ts

@@ -56,7 +56,9 @@ export default defineNuxtConfig({
   },
 
   unocss: {
-    autoImport: false,
+    // Storybook doesn't mount app.vue (where `uno.css` is imported),
+    // so disable this property only in non-storybook environments.
+    autoImport: isStorybook,
   },
 
   devtools: { enabled: true },