fix: emit layout change for batch node bounds (#5939)

## Summary

Fixes issue where node size changes are not serialized by routing
DOM-driven node bounds updates through a single CRDT operation so Vue
node geometry stays synchronized with LiteGraph.

## Changes

- **What**: Added `BatchUpdateBoundsOperation` to the layout store,
applied it via the existing Yjs pipeline, notified link sync to
recompute touched nodes, and covered the path with a regression test

## Review Focus

Correctness of the new batch operation when multiple nodes update
simultaneously, especially remote replay/undo scenarios and link
geometry recomputation.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5939-fix-emit-layout-change-for-batch-node-bounds-2846d73d365081db8f8cca5bf7b85308)
by [Unito](https://www.unito.io)

---------

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

src/renderer/extensions/vueNodes/layout/useNodeLayout.ts

@@ -258,14 +258,6 @@ export function useNodeLayout(nodeIdMaybe: MaybeRefOrGetter<string>) {
     mutations.moveNode(nodeId, position)
   }
 
-  /**
-   * Update node size
-   */
-  function resize(newSize: { width: number; height: number }) {
-    mutations.setSource(LayoutSource.Vue)
-    mutations.resizeNode(nodeId, newSize)
-  }
-
   return {
     // Reactive state (via customRef)
     layoutRef,
@@ -278,7 +270,6 @@ export function useNodeLayout(nodeIdMaybe: MaybeRefOrGetter<string>) {
 
     // Mutations
     moveTo,
-    resize,
 
     // Drag handlers
     startDrag,