docs: fix vue example

examples/nuxt-example/components/ui/card/Card.vue

@@ -0,0 +1,21 @@
+<script setup lang="ts">
+import type { HTMLAttributes } from 'vue'
+import { cn } from '@/lib/utils'
+
+const props = defineProps<{
+  class?: HTMLAttributes['class']
+}>()
+</script>
+
+<template>
+  <div
+    :class="
+      cn(
+        'rounded-xl border bg-card text-card-foreground shadow',
+        props.class,
+      )
+    "
+  >
+    <slot />
+  </div>
+</template>