refactor: use nuxt compatiable 4 folder

app/composables/count.ts

@@ -0,0 +1,20 @@
+import { useStorage } from '@vueuse/core'
+
+export function useCount() {
+  const count = useStorage('count', 5)
+
+  function inc() {
+    count.value += 1
+  }
+  function dec() {
+    if (count.value <= 1)
+      return
+    count.value -= 1
+  }
+
+  return {
+    count,
+    inc,
+    dec,
+  }
+}