Add a Simple Login API Integration (React + Node.js)

Need a developer to connect a React login form to an existing Node.js/Express backend. The work includes linking the form to the provided API endpoint, handling loading and error states, storing the JWT token in localStorage after successful login, and redirecting the user to the dashboard. The existing UI should remain unchanged. Deliverables include working login functionality, clean and well-structured code, and a brief explanation of the changes made. This is a small task with potential for additional work if everything goes well.