Describe the bug

When creating a custom header template, I need to properly set the id attribute to match the ariaLabelledBy reference used in the dialog's aria-labelledby attribute. Without access to this value, the accessibility relationship between the dialog and its label cannot be maintained.

Pull Request Link

#19334

Reproducer

https://primeng.org/dialog#template

Environment

Any

Angular version

21

PrimeNG version

v21

Node version

No response

Browser(s)

No response

Steps to reproduce the behavior

• Search for an item with the id of the aria-labelledby attribute on the div with role="dialog".
• It does not exist.

Expected behavior

The ariaLabelledBy value should be passed to the header template context, allowing developers to create accessible custom headers.