feat(Slideover): add prevent-close prop

docs/components/content/examples/SlideoverExampleCard.vue

@@ -0,0 +1,23 @@
+<script setup>
+const isOpen = ref(false)
+</script>
+
+<template>
+  <div>
+    <UButton label="Open" @click="isOpen = true" />
+
+    <USlideover v-model="isOpen">
+      <UCard class="flex flex-col flex-1" :ui="{ body: { base: 'flex-1' }, ring: '', divide: 'divide-y divide-gray-100 dark:divide-gray-800' }">
+        <template #header>
+          <Placeholder class="h-8" />
+        </template>
+
+        <Placeholder class="h-full" />
+
+        <template #footer>
+          <Placeholder class="h-8" />
+        </template>
+      </UCard>
+    </USlideover>
+  </div>
+</template>