feat: implement new ui

app/header.tsx

@@ -0,0 +1,52 @@
+import { GitHub, Vercel } from '@/components/icons'
+import './globals.css'
+
+import { Sidebar } from '@/app/sidebar'
+import { buttonVariants } from '@/components/ui/button'
+import { cn } from '@/lib/utils'
+import { Plus } from 'lucide-react'
+import Link from 'next/link'
+import { UserMenu } from '@/components/user-menu'
+import { auth } from '@/auth'
+
+export async function Header() {
+  const session = await auth()
+
+  return (
+    <header className="h-16 shrink-0 z-50 bg-gradient-to-b from-background/30 to-background/50 backdrop-blur-lg px-4 flex sticky top-0 w-full items-center justify-between">
+      <div className="flex items-center">
+        {/* @ts-ignore */}
+        <Sidebar />
+        <UserMenu session={session} />
+      </div>
+      <div className="flex space-x-2 items-center">
+        <Link href="/" className={cn(buttonVariants({ size: 'sm' }))}>
+          <Plus className="h-4 w-4 mr-2" />
+          New Chat
+        </Link>
+        <a
+          href="https://github.com/vercel/nextjs-ai-chatbot/"
+          target="_blank"
+          className={cn(
+            buttonVariants({ size: 'sm', variant: 'outline' }),
+            'space-x-2'
+          )}
+        >
+          <Vercel className="mr-2" />
+          Deploy
+        </a>
+        <a
+          target="_blank"
+          href="https://github.com/vercel/nextjs-ai-chatbot/"
+          className={cn(
+            buttonVariants({ size: 'sm', variant: 'ghost' }),
+            'h-9 w-9 p-0'
+          )}
+        >
+          <GitHub className="w-5 h-5" />
+          <span className="sr-only">View on GitHub</span>
+        </a>
+      </div>
+    </header>
+  )
+}