imTigger/SMS2Telegram — reverse-engineered prompt

Build me a simple Android app that forwards incoming SMS messages to my own Telegram chat using a bot I create myself. I want it to feel lightweight and privacy first, with no ads, no tracking, no premium upsells, and only the permissions it truly needs. It should work on older Android phones too, ideally Android 5 and up, so I can leave an old phone on to receive OTP codes and other texts.

The setup should be easy for a normal person. I want a screen where I can paste my Telegram bot token, tap something like Find Chat ID after sending a message to the bot, pick my account, then validate and save it. After that, new SMS messages should automatically be sent to that Telegram chat. Please keep everything direct between the phone and Telegram, with no third party server in the middle. If anything is unclear, look up the current Telegram bot docs online.