feat: use nuxt 4 structure

app/components/Counter.vue

@@ -0,0 +1,17 @@
+<script setup lang='ts'>
+const { count, inc, dec } = useCount()
+</script>
+
+<template>
+  <div inline-flex m="y-3">
+    <button rounded-full p-2 btn @click="dec()">
+      <div i-carbon-subtract />
+    </button>
+    <div font="mono" w="15" m-auto inline-block>
+      {{ count }}
+    </div>
+    <button rounded-full p-2 btn @click="inc()">
+      <div i-carbon-add />
+    </button>
+  </div>
+</template>