Fieldset: UniqueComponentId & aria-labelledBy

[Noemite]

Describe the bug

I found 2 issues :

• the id generated in the fieldset component is not unique (or too unique ?): a unique id is generated everytime we use the get id()
  
  The id is generated in a getter, so a unique id is created everytime we call id in the template ! (

  primeng/src/app/components/fieldset/fieldset.ts

  Line 185 in b99106f

  get id() {

  )
  Fix: the id should be generated only once in component init.

• the id header is missing if the user doesn't set toggleable=true
  If the fieldset is NOT toggleable, the aria-labelledby is broken
  

  primeng/src/app/components/fieldset/fieldset.ts

  Line 51 in b99106f

  [attr.id]="id + '_header'"

  
  

  primeng/src/app/components/fieldset/fieldset.ts

  Line 100 in b99106f

  [attr.aria-labelledby]="id + '_header'"

  
  Fix: [attr.id]="id + '_header'" should be elsewhere (legend or headerTemplate ?)

Environment

The issue was found using wave on firefox.
-> Broken aria reference.

Reproducer

No response

Angular version

18.2.8

PrimeNG version

18.0.0-beta.3

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

20.17.0

Browser(s)

No response

Steps to reproduce the behavior

No response

Expected behavior

No response