refactor(nodeInternals): widht and height types optional

src/hooks/useNodeDimensions.ts

@@ -16,8 +16,8 @@ function useNodeDimensions(id: string): Rect | null {
 
         return {
           ...nodeItem.positionAbsolute,
-          width: nodeItem.width,
+          width: nodeItem.width ?? 0,
-          height: nodeItem.height,
+          height: nodeItem.height ?? 0,
         };
       },
       [id]

src/types/nodes.ts

@@ -104,8 +104,6 @@ export type NodeDimensionUpdate = {
 };
 
 export type NodeInternalsItem = Node & {
-  width: number;
-  height: number;
   positionAbsolute: XYPosition;
   z: number;
   handleBounds?: NodeHandleBounds;