Add preview handling

pages/preview/+Page.vue

@@ -0,0 +1,59 @@
+<template>
+  <div class="preview-redirect">
+    <h1>Preview Handler</h1>
+    
+    <div v-if="error" class="error">
+      <h2>Debug Information</h2>
+      <p><strong>Error:</strong> {{ error }}</p>
+      <p v-if="pageContext"><strong>PageContext keys:</strong> {{ pageContext.join(', ') }}</p>
+      <pre v-if="urlParsed">{{ JSON.stringify(urlParsed, null, 2) }}</pre>
+    </div>
+    
+    <div v-else-if="redirectUrl">
+      <p>Redirecting to preview...</p>
+      <p>If you are not redirected automatically, <a :href="redirectUrl">click here</a>.</p>
+    </div>
+    
+    <div v-else>
+      <p>Processing preview request...</p>
+    </div>
+  </div>
+</template>
+
+<script setup>
+import { useData } from 'vike-vue/useData'
+import { onMounted } from 'vue'
+
+const data = useData()
+const { redirectUrl, error, pageContext, urlParsed } = data
+
+onMounted(() => {
+  if (redirectUrl) {
+    window.location.href = redirectUrl
+  }
+})
+</script>
+
+<style scoped>
+.preview-redirect {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  min-height: 50vh;
+  text-align: center;
+}
+
+h1 {
+  margin-bottom: 1rem;
+}
+
+a {
+  color: #007bff;
+  text-decoration: none;
+}
+
+a:hover {
+  text-decoration: underline;
+}
+</style>