feat: enhance CommandPalette UI, add Main component, and update localization for better user experience

app/components/chat/Main.vue

@@ -0,0 +1,18 @@
+<script lang="ts" setup>
+
+</script>
+
+<template>
+  <div class="flex flex-col my-16 md:my-32">
+    <h1 class="font-bold text-3xl sm:text-4xl">
+      Welcome to ArtChat
+    </h1>
+    <h3 class="text-3xl sm:text-4xl bg-gradient-to-r from-inverted/40 to-inverted/75 to-50% bg-clip-text text-transparent font-medium">
+      Ask me anything about Arthur DANJOU
+    </h3>
+  </div>
+</template>
+
+<style scoped>
+
+</style>