HeinHtetNyan/RateBridge — reverse-engineered prompt

Build me a clean currency exchange desk called RateBridge for people trading between MMK, THB, USD, and EUR.

I want a simple responsive web app that shows live exchange rates, updates automatically every 60 seconds, and clearly shows where each rate came from. It should include both real market style P2P rates and official CBM rates when available. Users should be able to enter an amount, choose currencies, and instantly see the main conversion plus the equivalent amounts in the other supported currencies.

Please include a special input for THB and MMK where users can type either THB per 100,000 MMK or MMK per 1 THB, and switch between the two formats without losing the value. Add small sparkline history charts for key pairs, a copied quote history for the current session, English and Myanmar language support, and dark and light mode that stays saved.

Use the existing frontend and backend setup. Make it easy to run locally, and look up current API docs online if needed.