feat(nuxt): nuxt3 -> nuxt4

app/components/header/ThemeSwitcher.vue

@@ -0,0 +1,23 @@
+<script setup lang="ts">
+const colorMode = useColorMode();
+
+const isDark = computed({
+  get() {
+    return colorMode.value === "dark";
+  },
+  set() {
+    colorMode.preference = colorMode.value === "dark" ? "light" : "dark";
+  },
+});
+</script>
+
+<template>
+  <UButton
+    :icon="isDark ? 'i-heroicons-moon-20-solid' : 'i-heroicons-sun-20-solid'"
+    color="neutral"
+    variant="ghost"
+    aria-label="Theme"
+    class="w-8 h-8"
+    @click="isDark = !isDark"
+  />
+</template>