Set placement preview and commit handlers in ViewportCanvas

src/viewport-three/ViewportCanvas.tsx

@@ -172,6 +172,14 @@ export function ViewportCanvas({
     });
   }, [onToolPreviewChange, panelId]);
 
+  useEffect(() => {
+    hostRef.current?.setPlacementPreviewChangeHandler(onToolPreviewChange);
+  }, [onToolPreviewChange]);
+
+  useEffect(() => {
+    hostRef.current?.setPlacementCommitHandler(onCommitPlacement);
+  }, [onCommitPlacement]);
+
   useEffect(() => {
     hostRef.current?.setToolMode(toolMode);
   }, [toolMode]);
@@ -180,6 +188,10 @@ export function ViewportCanvas({
     hostRef.current?.setBoxCreatePreview(toolMode === "box-create" && toolPreview.kind === "box-create" ? toolPreview.center : null);
   }, [toolMode, toolPreview]);
 
+  useEffect(() => {
+    hostRef.current?.setPlacementPreview(toolMode === "place" && toolPreview.kind === "placement" ? toolPreview : null);
+  }, [toolMode, toolPreview]);
+
   useEffect(() => {
     if (focusRequestId === 0) {
       return;