goel7/weight-tracker-web — reverse-engineered prompt

Build me a simple web app for tracking my fitness progress in one place. I want to be able to sign in, save my data, and come back later without losing anything.

The main thing is logging my body weight over time so I can see trends clearly, and I also want a section for tracking lifts or workouts so I can record exercises and watch my strength improve. Make the interface clean, fast, and easy to use on a laptop or phone, with charts or simple history views where it makes sense.

Please also include a way to import and export my data so I can back it up or move it elsewhere. If there is already a backend or database setup in the project, hook the app up properly so auth and saved data work end to end.

Keep the design lightweight and polished, and make sure the basic flows, sign in, add entries, view progress, edit mistakes, and export data, all work smoothly. Look up current docs online if you need to.