Alan-John-Thomas/chess-coach ? reverse-engineered prompt

Build me the Chess Coach app so a user can upload a chess game, see it analyzed, and get clear explanations in plain English about what went wrong and what they could have played instead.

The backend already sounds like it handles login, PGN uploads, Stockfish analysis, and saved positions, so please wire up a clean, simple frontend for that and make the whole thing feel like a real product. I want a login and signup flow, a place to paste or upload a PGN, a board view that shows the game move by move, and an analysis panel that explains blunders, tactical chances, and big evaluation swings in easy language. If there is a chat style review view, include that too.

Use the existing backend APIs where possible, and if something is missing, add the minimal frontend and backend pieces needed to make it work. Look up current docs online if you need to.