komikku-app/anikku — reverse-engineered prompt

Build me a free open source Android app for watching anime, cartoons, and series. I want it to feel like a polished anime library app, where people can browse sources, search for shows, add them to a library, organize them into categories, and quickly resume watching.

Include a built in video player with settings, downloaded or local video playback for offline watching, update notifications, cover art, and a clean details page with suggestions and related anime. Let users track progress with services like MyAnimeList, AniList, Kitsu, Simkl, Shikimori, and Bangumi, with progress sync when possible.

I also want useful power features like saved searches, feed views from multiple sources, custom covers, manual anime info editing, library backup and restore, migration between sources, filters for tracked or hidden content, and support for Android TV and Fire TV. Add theme customization, auto colors from cover art, cast support when available, and a smooth update flow.

Use current Android best practices and look up current docs online if needed.