Apply "Site Settings" > "Form Field" styling to select elements

## Prerequisites

- [X] I have searched for similar features requests in both open and closed tickets and cannot find a duplicate.
- [X] The feature is still missing in the latest stable version of Elementor ( Elementor Pro. )

**What problem is your feature request going to solve? Please describe.**
When configuring "Form Fields" under "Site Settings" the field section does not apply to select elements. Therefore, if you have specified text colours, borders and radius defaults for form fields here, it's then necessary to apply the same CSS manually specifically for select elements.

**Describe the solution you'd like**
Either also apply the styling to select elements or provide a seperate section for select elements specifically.

**Describe alternatives you've considered**
Manually applying the CSS - but this isn't great because you end up with half the form field styling configured in the Form Fields area and half in the CSS.

Start in the Site Settings Form Fields control and trace how its text colors, borders, and radius are applied to form inputs. Compare that path with select elements. Done means select elements inherit the configured styling, or a separate select-styling section exists, while existing form-field behavior remains intact.

Written by the indexing model from the issue text.