Ensure users are properly redirected after successfully logging in

Fix: Handle response data from login API to correctly set user context.
Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 91318273-c764-4fd4-be04-bdc12c38af32
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/0715008c-7244-40f4-befc-26c014852236/ab880d72-1a34-4d36-b5be-9f44df85ed1a.jpg

client/src/hooks/useAuth.ts

@@ -37,7 +37,8 @@ export function useAuth() {
         method: 'POST', 
         body: JSON.stringify(credentials) 
       });
-      return response.json();
+      const data = await response.json();
+      return data;
     },
     onSuccess: (data) => {
       setUser(data.user);