darshmarket-art/Catalogue_app ? reverse-engineered prompt

Build me a simple catalogue app for showing products or services in a clean way, with a nice mobile friendly interface and a basic merchant area so someone can manage listings. I want the app to feel polished, modern, and easy to browse, with categories, item cards, search or filtering if it makes sense, and a detail page for each item.

Please make it work well as a web app first, and keep it easy to run locally and deploy. If the project already has some theme or server setup, wire everything together instead of starting from scratch. Use the existing app structure where possible, add any missing pages or components, and make sure the main flows work end to end.

If you need to check current docs or best practices for anything, look them up online and keep the implementation practical. After building it, make sure it runs without obvious errors and the app feels ready to use.