修复 UI 预览拖拽重置视口

仅在画布尺寸或像素单位变化时重新计算预览尺寸

避免节点拖拽的状态深拷贝触发全画布适配

apps/ai-game-creator-shell/src/view/ui-editor/components/preview/PreviewWorkspace.tsx

@@ -47,12 +47,21 @@ export function PreviewWorkspace({
     useState<UiEditorRenderMode>('editor-overlay');
   const [showFrame, setShowFrame] = useState(false);
   const tree = controller.treeForActiveImage ?? null;
+  const activeImagePixelWidth = activeImage?.pixel_size[0];
+  const activeImagePixelHeight = activeImage?.pixel_size[1];
+  const activeImagePixelsPerUnit = activeImage?.pixels_per_unit;
   const logicalSize = useMemo(() => {
-    if (!activeImage) return null;
-    const ppu = activeImage.pixels_per_unit;
+    if (
+      activeImagePixelWidth === undefined ||
+      activeImagePixelHeight === undefined ||
+      activeImagePixelsPerUnit === undefined
+    ) {
+      return null;
+    }
+    const ppu = activeImagePixelsPerUnit;
     if (!Number.isFinite(ppu) || ppu <= 0) return null;
-    const width = activeImage.pixel_size[0] / ppu;
-    const height = activeImage.pixel_size[1] / ppu;
+    const width = activeImagePixelWidth / ppu;
+    const height = activeImagePixelHeight / ppu;
     if (
       !Number.isFinite(width) ||
       !Number.isFinite(height) ||
@@ -62,7 +71,7 @@ export function PreviewWorkspace({
       return null;
     }
     return { width, height };
-  }, [activeImage]);
+  }, [activeImagePixelHeight, activeImagePixelsPerUnit, activeImagePixelWidth]);
 
   const nodeInteractions = useNodeTransformInteraction({
     activeImageId,