kiiing025/zhang — reverse-engineered prompt

Build me a simple cross platform manga and comic reader called Zhāng in Flutter. I want it to feel like a clean starter app for reading my own comic library, not a piracy app. It should open to a library screen with a few sample series so the app does not look empty. Tapping a series should show a detail page and a basic reader view shell where pages could be shown later. Add an extensions area that lists bundled source connector info, plus simple import and settings screens so the navigation feels complete.

Keep the design calm and mobile friendly, with clear empty states and labels a normal reader understands. Please wire the navigation together, keep the data in simple local models for now, and include basic tests for the library data, extension metadata, and moving through the main screens. Make it run on Android and iOS. Look up current Flutter docs online if needed.