Aurora Messenger v0.2.0-pre

Second pre-alpha.

Added - In-app video playback: first-frame thumbnails plus a fullscreen player (play/pause, scrubbable seek bar, elapsed/total time). Video is decrypted and played from memory and stays inside the FLAG_SECURE window.

Fixed - Calls no longer drop when you leave the app. While a call is live the foreground service holds the microphone (and camera, for video) service type, so backgrounding (Back / screen off) no longer lets the OS cut mic/camera or battery saver drop the call.

Changed - Large behaviour-preserving architecture cleanup (role-based class names, god-class/screen splits, EncryptedMediaStore, Kotlin-convention pass) and a new crypto + app test suite.

Full notes in CHANGELOG.md. Android 10+, sideload. Pre-alpha and experimental.