Revert "Hide Ai assistant"

This reverts commit 04efe5f.

Author: antalike

app/components/AppHeader.vue

@@ -58,7 +58,7 @@ function gotoHome() {
         base: 'w-90 h-10 text-[#94A3B8] rounded-lg ring-slate-600'
       }"
     />
-    <!-- <AssistantCollapse class="ml-2.5" /> -->
+    <AssistantCollapse class="ml-2.5" />
 
     <template #right>
       <LanguageSwitcher />