playground(card): add page

playground/components/Placeholder.vue

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+<template>
+  <div class="relative overflow-hidden rounded border border-dashed border-gray-400 dark:border-gray-500 opacity-75 px-4 flex items-center justify-center">
+    <svg class="absolute inset-0 h-full w-full stroke-gray-900/10 dark:stroke-white/10" fill="none">
+      <defs>
+        <pattern
+          id="pattern-5c1e4f0e-62d5-498b-8ff0-cf77bb448c8e"
+          x="0"
+          y="0"
+          width="10"
+          height="10"
+          patternUnits="userSpaceOnUse"
+        >
+          <path d="M-3 13 15-5M-5 5l18-18M-1 21 17 3" />
+        </pattern>
+      </defs>
+      <rect stroke="none" fill="url(#pattern-5c1e4f0e-62d5-498b-8ff0-cf77bb448c8e)" width="100%" height="100%" />
+    </svg>
+
+    <slot />
+  </div>
+</template>

playground/pages/card.vue

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+<template>
+  <UCard class="w-96">
+    <template #header>
+      <Placeholder class="h-8" />
+    </template>
+
+    <Placeholder class="h-32" />
+
+    <template #footer>
+      <Placeholder class="h-8" />
+    </template>
+  </UCard>
+</template>