React Frontend Enhancements Needed

My existing MERN application is running well, but the React side now needs some love. I want to bring in two things at once: fresh features and a sharper, more intuitive UI.

Here is what I need done:
• Build out new interactive components so the interface feels lively and responsive. Think dynamic dashboards, drag-and-drop elements, or any pattern that keeps users engaged.
• Add a solid user authentication flow that plugs neatly into the current Node/Express API. Social logins are optional, but clean signup, login, and protected-route handling are a must.
• While you work, polish the overall look and feel—better spacing, typography, and mobile responsiveness—so the design feels modern without rewriting everything from scratch.

I’ll provide the existing repo, API endpoints, and a short style guide. Your deliverable is an updated React codebase (well-commented) plus any supporting assets so I can merge straight into production and test.

If you have questions about state management, component libraries, or build tools, just let me know; I’m flexible as long as the final result is clean, maintainable React code.