* Wrapper for fetch with basic timeout and exponential backoff retry logic.

* Returns true if the user is actively typing in a form field or * contentEditable element. * * @param {EventTarget} target - The event's target el

* Normalises a shortcut key (lowercases letters so callers don't have * to worry about casing). * * @param {string} key * @returns {string}

* Normalizes Unicode characters that could be used to bypass regex-based detection. * Converts homoglyphs, fullwidth characters, and other confusable