Revert delay of layout initialization (#8619)

#7591 added a one tick delay to layout initialization in an attempt to
resolve some layouting discrepancies. However, it appears to have
reintroduced node scaling issues and introduced a new bug that prevents
cloning nodes with alt+drag in vue.

Alternatives methods of resolving the original issue are being
investigated, but this change was causing more harm than good.

The prior PR included other changes (like a testing fix). Those changes
remain beneficial and do not need to be reverted.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8619-Revert-delay-of-layout-initialization-2fe6d73d365081fc9111c9457ea9752d)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/composables/graph/useGraphNodeManager.ts

@@ -432,7 +432,7 @@ export function useGraphNodeManager(graph: LGraph): GraphNodeManager {
     } else {
       // Not during workflow loading - initialize layout immediately
       // This handles individual node additions during normal operation
-      requestAnimationFrame(initializeVueNodeLayout)
+      initializeVueNodeLayout()
     }
 
     // Call original callback if provided