appStateBackupFactory
fun appStateBackupFactory(factory: (seed: ByteArray) -> AppStateCloudBackup): <Error class: unknown class>
Optional cross-device backup of host app state (≤2 KB). The factory is invoked once during build with the wallet seed (so the coordinator derives its seed-based encryption key — no per-backup biometric). The resulting AppStateCloudBackup is wired into the wallet for silent automatic backup/restore. Omit it (default) and app-state backup is absent. Sibling of dustCloudBackupFactory.