chore: rollback to option instead of anyhow

packages/tui/examples/tui_colorpicker.rs

@@ -17,7 +17,7 @@ fn app(cx: Scope) -> Element {
             width: "100%",
             background_color: "hsl({hue}, 70%, {brightness}%)",
             onmousemove: move |evt| {
-                if let RenderReturn::Sync(Ok(node)) = cx.root_node() {
+                if let RenderReturn::Sync(Some(node)) = cx.root_node() {
                     if let Some(id) = node.root_ids[0].get() {
                         let node = tui_query.get(id);
                         let Size{width, height} = node.size().unwrap();