fix: custom node example not fitting view

* fit view can't work (for the onLoad event) for elements assigned after the host has mounted (onMounted hook) as we can't calculate a rect of elements that don't exist at flow creation
* in this case just trigger fit view __after__ elements have been created/passed to the flow

Signed-off-by: Braks <78412429+bcakmakoglu@users.noreply.github.com>

src/utils/graph.ts

@@ -222,7 +222,7 @@ export const getRectOfNodes = (nodes: Node[]): Rect => {
           ...position,
           width,
           height,
-        } as any),
+        }),
       ),
     { x: Infinity, y: Infinity, x2: -Infinity, y2: -Infinity },
   )