Finish typing tests proving timer, accuracy, and reset work

Continue the existing typing studio from the prior landed workspace. Make any necessary corrections, then provide executed browser evidence for the missing behaviors that blocked delivery. In a real browser, type one character, wait at least 1.2 seconds, assert the elapsed-time display advances from 00:00, type a deliberately incorrect character and assert the visible character feedback changes to incorrect and the accuracy decreases, then use backspace/correction and assert accuracy and feedback update. Complete a short passage and assert the timer stops; reset and assert fresh state. Keep the offline page, responsive accessible controls, pure scoring module and tests. Run the Node tests. Record probes with concrete commands and observable assertions, not source inspection alone.