Refactor App.tsx, brush-command-helpers.ts, editor-store.test.ts, and local-draft-storage.test.ts

src/app/App.tsx

@@ -128,15 +128,7 @@ export function App({ store, initialStatusMessage }: AppProps) {
 
     setPositionDraft(createVec3Draft(selectedBrush.center));
     setSizeDraft(createVec3Draft(selectedBrush.size));
-  }, [
-    selectedBrush?.id,
-    selectedBrush?.center.x,
-    selectedBrush?.center.y,
-    selectedBrush?.center.z,
-    selectedBrush?.size.x,
-    selectedBrush?.size.y,
-    selectedBrush?.size.z
-  ]);
+  }, [selectedBrush]);
 
   const applySceneName = () => {
     const normalizedName = sceneNameDraft.trim() || "Untitled Scene";

src/commands/brush-command-helpers.ts

@@ -38,7 +38,10 @@ export function replaceBrush(document: SceneDocument, brush: BoxBrush): SceneDoc
 }
 
 export function removeBrush(document: SceneDocument, brushId: string): SceneDocument {
-  const { [brushId]: _removedBrush, ...remainingBrushes } = document.brushes;
+  const remainingBrushes = {
+    ...document.brushes
+  };
+  delete remainingBrushes[brushId];
 
   return {
     ...document,