Nutrient
fun NutrientTheme(controller: NutrientThemeController = rememberNutrientThemeController(), content: @Composable () -> Unit)
Wraps content so its toolbar colors track runtime theme changes (THEME-3).
Reuses the existing XML→Compose bridge (getUiColors()) and theme provider (WithUiTheme): on each NutrientThemeController.invalidate the key changes, this recomposes, and the colors are re-read from the (now updated) theme — no Activity recreation needed.