derickbenites/tz-bridge ? reverse-engineered prompt

Build me a small web app that helps plan meetings between my current time zone and another one. I want to pick a date and time on either side and तुरंत see the matching time in the other zone, plus which hours overlap for working hours and whether daylight saving time changes the difference.

Keep it simple and browser only, no login, no backend, and no saved data. Use the browser time zone automatically for one side, and let me choose the other time zone from a list of real IANA zones. I mainly want it to be easy to use for comparing places like São Paulo and Vancouver.

Make the page clean and fast, with clear inputs and a readable summary of the result. If needed, look up current browser and time zone docs online and keep the logic small and reliable.