aeewws/codex-mobile-oneapk ? reverse-engineered prompt

Build me an Android app that feels like a real mobile product for using Codex, not a terminal app squeezed onto a phone.

I want a single APK for Android 9 and up on arm64 devices, with the runtime bundled inside the app and managed locally by the app itself. On first launch it should unpack what it needs, start the local backend automatically, and keep working even if the app gets interrupted. Please make login happen inside the app, with both browser sign in and device code authorization, plus a clean local sign out flow.

The main experience should be chat first, with a clear history view for old conversations, support for resuming threads, renaming, archiving, and deleting chats, and an easy way to switch models and settings like reasoning level and fast mode. Also add a simple way to attach photos or files from camera, gallery, or a file picker. If useful, look up current docs online while building.