sujalbhatt00/habit-flow ? reverse-engineered prompt

Build me a full stack habit tracker called HabitFlow where people can sign up, log in, and manage their own habits. I want users to be able to create, edit, and delete habits, mark them complete each day, undo a completion if they made a mistake, and see streaks automatically update. Please include a monthly calendar view for progress, plus search, filter, and sort options so it is easy to find habits. I also want a weekly analytics section with simple insights, and a profile page that shows habit counts and streak stats for the user. Make it feel clean and easy to use on the frontend, and connect everything to a secure backend with user specific data. If you need to look up current docs or best practices for any part, go ahead and do that.