fix: dark mode

nuxt.config.ts

@@ -1,9 +1,19 @@
 // https://nuxt.com/docs/api/configuration/nuxt-config
 export default defineNuxtConfig({
   modules: [
+    '@pinia/nuxt',
     '@nuxt/ui',
+    '@nuxtjs/color-mode',
     '@vueuse/nuxt',
   ],
+
+  colorMode: {
+    preference: 'system',
+    dataValue: 'theme',
+    classSuffix: '',
+    storage: 'cookie',
+  },
+
   css: ['~/assets/css/main.css'],
   compatibilityDate: '2024-11-01',
   devtools: { enabled: true },