Tree - Context menu can't be opened using keyboard

[infe42]

Describe the bug

The context menu of a tree item can't be opened using the keyboard (context menu key or context menu shortcut), because the (contextmenu) event listener is attached to the wrong element - the <li> is focused, but the event listener is on the <div> inside it.

Pull Request Link

#18254

Reason for not contributing a PR

• Lack of time
• Unsure how to implement the fix/feature
• Difficulty understanding the codebase
• Other

Other Reason

No response

Reproducer

https://primeng.org/tree#contextmenu

Environment

Angular version

21.x.x

PrimeNG version

v21

Node version

No response

Browser(s)

all

Steps to reproduce the behavior

1. Go to https://primeng.org/tree#contextmenu
2. Click a tree item
3. Press the context menu key or the context menu shortcut (Shift + F10 in Chrome)
   Actual behavior: The browser context menu is opened instead of the tree context menu.

Expected behavior

The tree context menu is opened.