moustaphahadjis/flutter_keyboard — reverse-engineered prompt

Build me a Flutter package that gives apps a polished custom on screen keyboard instead of the default phone keyboard. I want it to feel modern and responsive, with nice press animations, visual feedback, and haptic taps, and it should work well on both Android and iPhone.

It should be easy to drop into forms, login screens, search boxes, and regular text entry. Please support normal typing plus number and symbol layouts, shift and caps lock behavior, backspace, enter, and space. It should work with standard text fields as well as a custom text field widget, and I want a simple app wide setup option plus a per screen option. Make sure focused fields stay visible, Android back closes the keyboard first, and input formatters still work for things like numbers only, max length, email characters, and simple masks.

Please include a clean example app that shows common use cases like username, password, phone, PIN, price, and search so someone can test it quickly.