princeraj-in/City-Helpline ? reverse-engineered prompt

Build me a modern student help app called City Helpline that makes it easy to find verified PGs, hostels, mess and tiffin services, libraries, coaching centers, and a second hand marketplace in a city.

I want a clean, mobile friendly site where students can browse listings, search by city and category, see reviews and ratings, save favorites, and contact owners quickly. Add a budget planner page that helps users estimate monthly living costs like rent, food, commute, laundry, and pocket money, with a simple chart and a way to share or print the result. Also include a marketplace where students can post and browse used books, notes, furniture, coolers, cycles, and similar items.

Please make it support login, user roles for normal users, contributors, and admins, plus basic moderation for listings. Use the existing Firebase and Cloudinary setup if needed, and keep the design polished, responsive, and easy to use.