techabhiii03/contact-manager ? reverse-engineered prompt

Build me a modern contact manager web app with a clean dashboard where I can add, view, edit, delete, and search contacts by name, email, or phone.

I want it to feel polished and easy to use, with a responsive layout that works well on desktop and mobile, simple form validation, and toast messages for success and error feedback. Use a React frontend and a Node, Express, MongoDB backend with a REST API so the contact list stays in sync with the database. Make sure the app has a nice dashboard style, an add contact form, an edit contact flow, and a way to see all contacts clearly in one place.

If you need to check any current React or Node docs while building it, feel free to look them up online.