docs(app): implement AI search

docs/app/components/prose/PreStream.vue

@@ -0,0 +1,44 @@
+<script setup lang="ts">
+import { ShikiCachedRenderer } from 'shiki-stream/vue'
+
+const colorMode = useColorMode()
+const highlighter = await useHighlighter()
+const props = defineProps<{
+  code: string
+  language: string
+  class?: string
+  meta?: string
+}>()
+const trimmedCode = computed(() => {
+  return props.code.trim().replace(/`+$/, '')
+})
+const lang = computed(() => {
+  switch (props.language) {
+    case 'vue':
+      return 'vue'
+    case 'javascript':
+      return 'js'
+    case 'typescript':
+      return 'ts'
+    case 'css':
+      return 'css'
+    default:
+      return props.language
+  }
+})
+const key = computed(() => {
+  return `${lang.value}-${colorMode.value}`
+})
+</script>
+
+<template>
+  <ProsePre v-bind="props">
+    <ShikiCachedRenderer
+      :key="key"
+      :highlighter="highlighter"
+      :code="trimmedCode"
+      :lang="lang"
+      :theme="colorMode.value === 'dark' ? 'material-theme-palenight' : 'material-theme-lighter'"
+    />
+  </ProsePre>
+</template>