marketcalls/fyers-websockets ? reverse-engineered prompt

Build me a real time Fyers market depth dashboard that shows a 50 level order book and updates live from the TBT feed. I want a clean trading style screen where I can log in with Fyers, connect to my account, and see bid and ask levels, volume, price movement, and clear buy versus sell pressure at a glance.

Please include a simple auth flow, secure token storage, and a backend that keeps the connection stable and reconnects if it drops. The app should also show order book imbalance for short, medium, and full depth views, plus a way to switch the display between shares and lots. Make the interface look modern and easy to read, with the most important numbers obvious first. If you need current Fyers docs or API details, look them up online and wire it up properly.