refactor: migrate auth pages to better-auth client

src/components/sign-in.tsx

@@ -1,20 +1,20 @@
 "use client"
 
-import { signOut, useSession } from "next-auth/react"
+import { signOut, useSession } from "@/lib/auth-client"
 import { Button } from "@/components/ui/button"
 import { useRouter } from "next/navigation"
 
 export default function SignIn() {
-  const { data: session, status } = useSession()
+  const { data: session, isPending } = useSession()
   const router = useRouter()
 
   const handleSignOut = async () => {
-    await signOut({ redirect: false })
+    await signOut()
     router.push("/")
     router.refresh()
   }
 
-  if (status === "loading") {
+  if (isPending) {
     return <div className="h-8 w-16 bg-muted animate-pulse rounded"></div>
   }