MrDeveloperJIS/cash-calculator ? reverse-engineered prompt

Build me a lightweight Windows cash counting app that works fully offline and feels fast and simple.

I want to enter how many notes and coins I have, and see the total update instantly as I type. It should support BDT, INR, USD, EUR, and GBP, with the right number formatting and amount in words for each currency. For BDT and INR, use the lakh and crore style, and for USD, EUR, and GBP, use the usual thousand and million style. Let me switch currency and theme from a settings screen, including light, dark, and system mode. I also want to be able to add or remove denominations so it is not locked to one fixed set. Add a one click reset button, and make the app remember its window size and position when reopened.

Keep it very lightweight, no login, no internet needed, and make the UI clean and easy to use. If you need to look up current docs online, go ahead.