KOSASIH/pi-quantum-card — reverse-engineered prompt

Build me a polished JavaScript prototype for Pi Quantum Card, a futuristic digital payment and identity app for the Pi ecosystem. I want it to feel like a real product, not just a landing page. A user should be able to create or view their digital card, see identity details, check a payment balance, send and receive payments in a simple demo flow, and go through a secure sign in experience that includes biometric style verification as a simulated feature.

Please lean into the quantum security theme in the UI and product language, but keep the actual security features realistic for a prototype. If augmented reality is included, make it a lightweight card preview experience rather than anything too heavy. Add clear screens, smooth navigation, sensible sample data, and basic tests so the main flows work.

Also include concise docs so someone can run it locally and understand what is real, what is mocked, and what is just a concept demo. Look up current docs online if you need to.