tl;dr: GrapheneOS has released version 13 of its Messages app, a full rewrite using Jetpack Compose and Material 3 with a two-pane layout for large screens. The update overhauls nearly every feature—conversation list, media picker, sharing, settings—and adds pinning, snoozing, archiving, attachment captions, and rebuilt photo/vCard viewers. It also brings significant privacy and security hardening (opt-in link previews, stricter shared-content validation, immutable pending intents, parser allocation limits) alongside numerous crash and notification bug fixes.