[backport core/1.35] Fix: the wrong selection under the hand mode (#7720)

## Summary

Backport of #7541 to core/1.35.

Fixed an inconsistency where nodes were resizable in Hand mode. Resizing
is now restricted to Selection mode only to match standard LiteGraph
behavior (Hand mode should only be for panning).

## Changes

- Added guard clause to prevent resize in Hand mode
(`shouldHandleNodePointerEvents` check)

## Original PR

https://github.com/Comfy-Org/ComfyUI_frontend/pull/7541

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7720-backport-core-1-35-Fix-the-wrong-selection-under-the-hand-mode-2d16d73d3650813bb00ff906db0440c2)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Kelly Yang <124ykl@gmail.com>
Co-authored-by: GitHub Action <action@github.com>

src/renderer/extensions/vueNodes/components/LGraphNode.vue

@@ -342,6 +342,7 @@ const { startResize } = useNodeResize((result, element) => {
 
 const handleResizePointerDown = (event: PointerEvent) => {
   if (event.button !== 0) return
+  if (!shouldHandleNodePointerEvents.value) return
   if (nodeData.flags?.pinned) return
   startResize(event)
 }