Liseur v0.3.2

Liseur now takes its colours from your wallpaper on Android 12 and up. Turn it off in Settings for the app's own paper-and-ink palette -- which has had a going-over too: the light theme is on white paper instead of cream, the dark theme no longer has faintly purple cards in the middle of it, and selection is warm brown rather than green. The splash screen follows the wallpaper too, so the app no longer flashes white on opening. The Downloaded filter waits until you connect a book server.