ayush-devcore/BiasLens ? reverse-engineered prompt

Build me a web app called BiasLens that lets users upload a dataset and quickly see if it has gender or socio economic bias.

I want a clean dashboard where someone can drop in a CSV, get the data analyzed in memory, and see fairness results with simple charts and clear explanations. The app should check things like disparate impact, statistical parity, equal opportunity, average odds, predictive parity, calibration, individual fairness, proxy columns, and inequality scores. After the analysis, it should give a plain English summary that explains what the numbers mean and suggest practical ways to reduce bias.

Please make it feel modern and polished, with a strong visual design and animated background if it fits. Include sign in so users can access their reports securely, and make sure the app does not store uploaded data permanently. Use the current best docs online if you need to, and build both the frontend and backend so the whole flow works end to end.