Thinking

let trace = ThinkingTrace::new()
    .thought_for(Duration::from_secs(9))
    .steps([
        ThinkingStep::new("Reading the supplier schema")
            .status(StepStatus::Done),
        ThinkingStep::new("Comparing unit prices")
            .detail("Alpenrose is **7% cheaper** at equal volume.")
            .status(StepStatus::Done),
        ThinkingStep::new("Checking delivery constraints"),
    ]);
let trace = if self.sim.answer.is_streaming() {
    Progressive::running(trace)
} else {
    Progressive::complete(trace)
};
v_flex()
    .gap_8()
    .child(
        Thinking::new("trace", &trace)
            .open(self.trace_open)
            .on_event(cx.listener(
                |this, event: &ThinkingEvent, _, cx| {
                    let ThinkingEvent::Toggled { open, .. } = event;
                    this.trace_open = *open;
                    cx.notify();
                },
            )),
    )
    .child(
        v_flex()
            .gap_3()
            .child(
                div()
                    .text_xs()
                    .font_semibold()
                    .text_color(cx.theme().muted_foreground)
                    .child("THINKING — PROSE"),
            )
            .child(Thinking::new(
                "trace-prose",
                &Progressive::complete(
                    ThinkingTrace::new()
                        .thought_for(Duration::from_secs(4))
                        .prose(
                            "The March sheet supersedes prior quotes, so the \
                             comparison should use *current* volume tiers. \
                             Delivery windows match, which removes the main \
                             switching risk.",
                        ),
                ),
            )
            .open(true)),
    )