Snouzy/workout-cool ? reverse-engineered prompt

Build me a modern fitness coaching web app where people can create workout plans, browse a big exercise library, and track their progress over time. I want it to feel clean and premium, like a real product, with a simple dashboard, workout planning flow, exercise detail pages, and progress charts or history so users can see how they are improving.

Please include exercise entries with names, descriptions, instructions, and video or image previews, and make it easy to search and organize them. If it fits naturally, add sign in, saved plans, and basic admin or import support for loading exercise data from CSV. Keep the design responsive and polished, and use the existing app structure and styling in the repo. Also make sure it works with a PostgreSQL database and the project can be run locally with the provided setup. If you need to check anything, look up current docs online first.