p-menu Nested MenuItem visible flag doesn't work on PrimeNG v19

[shawnweeks]

Describe the bug

The p-menu component's MenuItem visible flag doesn't work for nested items in PrimeNG 19+. This appears to be due to a missing p-hidden CSS style that was included in previous versions. This is a followup to #17204 which resolved the issue for non nested menu items.

Pull Request Link

No response

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://stackblitz.com/edit/github-nr4xpl6r-qntkcyjt

Environment

Default StickBlitz environment based on PrimeNG Issue Template

Angular version

19.0.5

PrimeNG version

v19

Node version

18.20.3

Browser(s)

Firefox Latest, Chrome Latest, Safari Latest

Steps to reproduce the behavior

1. Open Stackblitz link.
2. Wait for project to start.
3. Click green button
4. Notice Search-Hidden isn't hidden despite visible flag being set to false

Expected behavior

Search-Hidden menu item should be hidden

[junyou1998]

same

[Tsai-Ching]

Same