Successfully modified file: /home/Messier82/projects/service-book/app/src/main/java/com/yorvana/MainActivity.kt (1 replacements). Here is the updated code:
...
        )
    }

    // key(dest) re-creates AppNavGraph when the destination flips between Setup and
    // VehicleList, so rememberNavBackStack starts fresh with the correct root.
    val vaultUriString by remember {
        application.preferences.preferences
            .map { it.vaultUriString }
    }.collectAsStateWithLifecycle(initialValue = null)

    android.util.Log.d("MainActivity", "Recomposing MainContent: dest=$startDestination, uri=$vaultUriString")

    startDestination?.let { dest ->
        key(dest) {
            AppNavGraph(startDestination = dest)
        }
    }
}