fix: replace beforeLoad redirect with client-side navigate on backoffice index route

apps/backoffice/src/routes/index.tsx

@@ -1,12 +1,30 @@
-import { createFileRoute, redirect } from '@tanstack/react-router'
+import { createFileRoute, useNavigate } from '@tanstack/react-router'
 import { SessionToken } from '@imphnen-frontend-service/service'
+import { useEffect } from 'react'
 
 export const Route = createFileRoute('/')({
-  beforeLoad: () => {
-    const session = SessionToken.get()
-    if (session?.token?.access_token) {
-      throw redirect({ to: '/hackathon-dashboard' })
-    }
-    throw redirect({ to: '/auth/login' })
-  },
+  component: IndexRedirect,
 })
+
+function IndexRedirect() {
+  const navigate = useNavigate()
+
+  useEffect(() => {
+    try {
+      const session = SessionToken.get()
+      if (session?.token?.access_token) {
+        navigate({ to: '/hackathon-dashboard' })
+      } else {
+        navigate({ to: '/auth/login' })
+      }
+    } catch {
+      navigate({ to: '/auth/login' })
+    }
+  }, [navigate])
+
+  return (
+    <div style={{ display: 'flex', alignItems: 'center', justifyContent: 'center', minHeight: '100vh' }}>
+      <div style={{ width: 40, height: 40, border: '3px solid #e5e7eb', borderTopColor: '#3b82f6', borderRadius: '50%', animation: 'spin 0.8s linear infinite' }} />
+    </div>
+  )
+}