henryxrl/SimpleTextReader ? reverse-engineered prompt

Build me a polished TXT reader app that makes plain text novels feel like a real reading experience.

I want to be able to drag and drop one or many TXT files into it, or pick them manually, and have the app quickly open big files without freezing. It should try to detect the file’s language and encoding, figure out the book title and author automatically when it can, build a clean table of contents, and remember exactly where I left off. It should also make a bookshelf for all the books I’ve added, show reading progress, and let me filter or remove books easily.

Please include a nice reading view with dark mode, adjustable fonts and spacing, support for a few custom fonts, keyboard shortcuts for turning pages and jumping chapters, footnotes, and the ability to mark a line as a chapter title. Keep it elegant and simple, and make it work well in the browser, like a small reading app people would actually enjoy using.