fix(control): capture after the next rendered frame

src/app/mod.rs

@@ -2166,6 +2166,10 @@ pub enum Message {
     ControlStep(String, Box<Message>),
     ControlTaskDone(String),
     ControlScreenshot(String, Option<iced::window::Screenshot>),
+    /// A frame has been drawn (or the anti-hang timer expired) for a parked
+    /// `capture` request: take the screenshot now, so it shows the latest
+    /// state instead of the previous frame (C11).
+    ControlCaptureFrame { redrew: bool },
     ControlToggle,
     /// Node graph overlay interaction.
     Graph(crate::ui::node_graph::GraphMsg),