Fix login redirect - use server-side redirect instead of redirect:false

The signIn with redirect:false + router.push wasn't working
properly. Switched to callbackUrl approach where the server
handles the 302 redirect and cookie setting natively.

cookies.txt

@@ -0,0 +1,7 @@
+# Netscape HTTP Cookie File
+# https://curl.se/docs/http-cookies.html
+# This file was generated by libcurl! Edit at your own risk.
+
+#HttpOnly_localhost	FALSE	/	FALSE	1782744103	next-auth.session-token	eyJhbGciOiJkaXIiLCJlbmMiOiJBMjU2R0NNIn0..sTq2NT-4CyoN9xHf.XbycUv1magKQZIOpnjRtViV-R7kDNoAmG9uHcvK6Yx0_jJxcOhPp8_Or5XinQtMTYDoMSGsoR5aTt1zkH8RB1d6D9s-7fE7eMMt8YxCs7WTTaP_ES6aDWH06w7B8IiSWlnqAYi5Qs1KVAYWHLMBLMsU04n5qA6YttlYxTW_cBBdLR8C_UPa9NwNJxVtcXVfgOtWdosoc8x88Two39U9ylQ3vNkTVbEFO1o3o1QB2MpPboWcvzUPnYGgaYXQ2z3uGbInIeIJTB6QYVfqPeSdyroP-uSGh2cT_.zSa0swhlkozNLXOuC6QFTA
+#HttpOnly_localhost	FALSE	/	FALSE	0	next-auth.csrf-token	69bf7c3ba6e09540208c60c74bee0e63213544d508e4b4e4e33541160efe2dae%7C6130062784bd8a3d2ef18b88eb8c23a689728bbbdfebe0d9a316044c1229365a
+#HttpOnly_localhost	FALSE	/	FALSE	0	next-auth.callback-url	http%3A%2F%2Flocalhost%3A3000

src/app/login/page.tsx

@@ -1,8 +1,8 @@
 'use client'
 
-import { useState } from 'react'
+import { useState, useEffect } from 'react'
 import { signIn } from 'next-auth/react'
-import { useRouter } from 'next/navigation'
+import { useSearchParams } from 'next/navigation'
 import { Eye } from 'lucide-react'
 import { Button } from '@/components/ui/button'
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
@@ -10,32 +10,29 @@ import { Input } from '@/components/ui/input'
 import { Label } from '@/components/ui/label'
 
 export default function LoginPage() {
-  const router = useRouter()
+  const searchParams = useSearchParams()
   const [email, setEmail] = useState('')
   const [password, setPassword] = useState('')
   const [error, setError] = useState('')
   const [loading, setLoading] = useState(false)
 
+  useEffect(() => {
+    const err = searchParams.get('error')
+    if (err === 'CredentialsSignin') {
+      setError('Email ou mot de passe incorrect')
+    }
+  }, [searchParams])
+
   async function handleSubmit(e: React.FormEvent) {
     e.preventDefault()
     setError('')
     setLoading(true)
 
-    const result = await signIn('credentials', {
+    await signIn('credentials', {
       email,
       password,
-      redirect: false,
+      callbackUrl: '/',
     })
-
-    setLoading(false)
-
-    if (result?.error) {
-      setError('Email ou mot de passe incorrect')
-      return
-    }
-
-    router.push('/')
-    router.refresh()
   }
 
   return (