coderdoctor97/typing_the_book ? reverse-engineered prompt

Build me a browser only typing practice app where I can upload a text, Markdown, or DOCX file, pick a passage from it, and then type along to practice. I want it to feel simple and clean, with the text shown clearly, live feedback as I type, a timer that starts on my first real keystroke, and stats like speed, accuracy, and progress. If I miss words, save those mistakes locally so I can come back later and practice them again in a review mode.

Please keep everything private in the browser, do not upload my files anywhere, and only store the mistake history and sound settings in local storage. It should handle TXT with line breaks, Markdown with formatting, and DOCX in a readable way. If someone tries to use an old binary DOC file, show a helpful message telling them to convert it first. Add a small click sound for typing, and make sure paste is blocked so the practice stays honest.