Previously, right-clicking on a Vue node would deselect all other
selected nodes because the pointerup event handler was calling
toggleNodeSelectionAfterPointerUp regardless of which mouse button was
released.

This fix skips selection handling when the right mouse button (button 2)
is released, allowing the context menu to operate on the existing
selection.

  ## Summary
- Fixes right-click deselecting all selected nodes when using Vue node
rendering
- Now right-clicking preserves the existing selection, allowing context
menu
  actions on multiple nodes

  ## Problem
When multiple nodes were selected and user right-clicked on one of them,
the
`pointerup` event handler would call
`toggleNodeSelectionAfterPointerUp`, which
deselected everything except the clicked node. This broke multi-node
context menu
  operations.

  ## Solution
Skip selection handling in `onPointerup` when `event.button === 2`
(right-click).
  The context menu handler manages selection independently
fix #7136
Before 


https://github.com/user-attachments/assets/23ac5e03-c464-44b7-8950-67c14da9e02b





After


https://github.com/user-attachments/assets/9d1bd6a8-6386-442b-9dc4-6bc8fbe4a0a8

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7162-fix-preserve-node-selection-on-right-click-2bf6d73d365081acaf75f2fc845bbffb)
by [Unito](https://www.unito.io)

---------

Co-authored-by: GitHub Action <action@github.com>