Add useEffect to update whitebox snap step draft on editor state changes

src/app/App.tsx

@@ -1801,6 +1801,10 @@ export function App({ store, initialStatusMessage }: AppProps) {
     setSceneNameDraft(editorState.document.name);
   }, [editorState.document.name]);
 
+  useEffect(() => {
+    setWhiteboxSnapStepDraft(String(editorState.whiteboxSnapStep));
+  }, [editorState.activeSceneId, editorState.whiteboxSnapStep]);
+
   useEffect(() => {
     setSceneLoadingHeadlineDraft(
       activeProjectScene.loadingScreen.headline ?? ""