floatlabel on select and multiselect and inputgroup

Describe the bug

Floatlabel variant "on" on a select/multiselect with a placeholder is positioned in the select/multiselect. Should be positioned like in a filled component.

Floatlabel on an inputgroup is positioned behind the component when the input is focused. Should be visible above the input.

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/27uwnffj?file=src%2Fapp%2Ffloat-label-basic-demo.scss

Environment

Windows

Angular version

20.0.4

PrimeNG version

v20

Node version

No response

Browser(s)

No response

Steps to reproduce the behavior

Create a floatlabel on a select/multiselect component with a placeholder.

Expected behavior

Floatlabel is positioned correctly above the select/multiselect with a placeholder, like in a filled input.

Floatlabel on an inputgroup should be visible.

PrimeNG is missing the css selectors for floatlabel:
.p-floatlabel:has(.p-select[placeholder]) label,
.p-floatlabel:has(.p-multiselect[placeholder]) label

.p-floatlabel-on:has(.p-select[placeholder]) label,
.p-floatlabel-on:has(.p-multiselect[placeholder]) label

Example CSS fix is in the stackblitz scss file.

Start with the linked StackBlitz reproducer and inspect PrimeNG's floatlabel styles for select, multiselect, and inputgroup. Verify the placeholder selectors and focused inputgroup state against the expected filled-style positioning; done when both controls display labels above the component and remain visible when focused.