fix notification and add billing page and contract

apps/dashboard/src/lib/api.ts

@@ -4,6 +4,7 @@ export const API_BASE =
     : (process.env.NEXT_PUBLIC_API_URL || 'http://localhost:4000/api/v1')
 
 export const EMPLOYEE_TOKEN_KEY = 'employee_token'
+export const EMPLOYEE_PROFILE_KEY = 'employee_profile'
 
 async function getAuthToken(): Promise<string | null> {
   if (typeof window === 'undefined') return null