yuvrajshrirame/doit-mern ? reverse-engineered prompt

Build me a habit tracker web app called do.it that feels polished and fast, with a beautiful Apple style liquid glass look, soft blur effects, and smooth animations.

I want people to be able to jump in right away as a guest, then later sign in and keep their data. Let them create habits, pick an icon and color, mark habits as done each day, and see their progress with streaks and a yearly heatmap style view. Add a built in focus timer too, so it feels like a productivity app, not just a checklist.

Make it keyboard friendly and easy to use without the mouse, with simple modals for adding and editing habits. Use a modern React frontend and an Express and MongoDB backend, and keep the app responsive and clean. If you need to check current docs for anything, look them up online.