Wire frontend login to user_login.

Co-authored-by: Cursor <cursoragent@cursor.com>

context/AuthContext.tsx

@@ -5,7 +5,7 @@ import type { User } from '../types/api.ts';
 type AuthContextValue = {
   user: User | null;
   loading: boolean;
-  login: (userName: string, password: string) => Promise<void>;
+  login: (userLogin: string, password: string) => Promise<void>;
   logout: () => Promise<void>;
   refreshUser: () => Promise<User | null>;
 };
@@ -45,9 +45,9 @@ export const AuthProvider: React.FC<{ children: React.ReactNode }> = ({ children
     };
   }, []);
 
-  const login = useCallback(async (userName: string, password: string) => {
+  const login = useCallback(async (userLogin: string, password: string) => {
     await api.auth.csrf();
-    const next = await api.auth.login(userName, password);
+    const next = await api.auth.login(userLogin, password);
     setUser(next);
   }, []);