It's not clear when a range isn't set

### Expected Behaviour

It should be obvious what value a range has before a user interacts with it.

### Observed Behaviour

The unset behaviour looks like the lowest value is selected.

### Reproduction Steps

Form (XML or XLSX file): The all questions form works

### Screenshots or Videos

This is what it looks like when it's not set to anything:

As opposed to this when the user has picked the smallest value:

### Environment

- Browser version: Firefox
- OS: Ubuntu
- Web Forms version: latest

### Additional Context

There's no setting in primevue to change this so it'll need to be a downstream change or a patch provided to primevue library.

Start by locating the range control and its PrimeVue integration, then reproduce the issue with the all questions form in Firefox. Compare the unset control with the explicitly selected smallest value; done when users can clearly distinguish those states without changing the form's intended range values.

Written by the indexing model from the issue text.