Feature: Implement and integrate transform preview change handling

src/app/App.tsx

@@ -4601,7 +4601,13 @@ export function App({ store, initialStatusMessage }: AppProps) {
 
         if (event.key === "Enter") {
           event.preventDefault();
-          commitTransformSession(transformSession);
+          const latestTransformSession =
+            latestActiveTransformSessionRef.current;
+          commitTransformSession(
+            latestTransformSession?.id === transformSession.id
+              ? latestTransformSession
+              : transformSession
+          );
           return;
         }
 
@@ -14239,8 +14245,16 @@ export function App({ store, initialStatusMessage }: AppProps) {
                   onWhiteboxSnapStepDraftChange={setWhiteboxSnapStepDraft}
                   onWhiteboxSnapStepBlur={handleWhiteboxSnapStepBlur}
                   onTransformSessionChange={(nextTransformSession) => {
+                    latestActiveTransformSessionRef.current =
+                      nextTransformSession.kind === "active"
+                        ? nextTransformSession
+                        : null;
                     store.setTransformSession(nextTransformSession);
                   }}
+                  onTransformPreviewChange={(nextTransformSession) => {
+                    latestActiveTransformSessionRef.current =
+                      nextTransformSession;
+                  }}
                   onTransformCommit={commitTransformSession}
                   onTransformCancel={() => cancelTransformSession()}
                   onSelectionChange={(selection) =>

src/viewport-three/ViewportCanvas.tsx

@@ -73,7 +73,7 @@ interface ViewportCanvasProps {
   onCameraStateChange(cameraState: ViewportPanelCameraState): void;
   onToolPreviewChange(toolPreview: ViewportToolPreview): void;
   onTransformSessionChange(transformSession: TransformSessionState): void;
-  onTransformPreviewChange(transformSession: ActiveTransformSession): void;
+  onTransformPreviewChange?(transformSession: ActiveTransformSession): void;
   onTransformCommit(transformSession: ActiveTransformSession): void;
   onTransformCancel(): void;
 }
@@ -110,7 +110,7 @@ export function ViewportCanvas({
   onCameraStateChange,
   onToolPreviewChange,
   onTransformSessionChange,
-  onTransformPreviewChange,
+  onTransformPreviewChange = () => undefined,
   onTransformCommit,
   onTransformCancel
 }: ViewportCanvasProps) {