ActionRow

A row for scripted timelines rather than live tool parts. While state is animating it shows a rotating shimmer label (Brewing..., Crafting..., chosen by index); after step.duration milliseconds it calls onComplete, and once complete it shows step.toolName. Use it for product tours, demos and onboarding replays built from ToolCallStep objects. For real agent output, render tool parts with ToolRenderer or MessageList instead. useToolComplete is the hook behind the timer.