ZhanZiyuan/tachiyomi ? reverse-engineered prompt

Build me an Android manga reader app that feels polished and easy to use.

It should let people browse and read manga from online sources, open downloaded chapters for offline reading, and switch between a few reading modes and directions so it works for different preferences. I want a library screen where users can organize manga into categories, track progress with services like MyAnimeList, AniList, Kitsu, MangaUpdates, Shikimori, and Bangumi, and choose between light and dark themes. It should also check for new chapters on a schedule, and let users make backups so they can restore their library later or move it to cloud storage. Please make it work well on Android 6 and above, and keep the design clean and simple. If you need to look up any current Android docs while building it, go ahead.