Allow users to use halstack scroll styles

[GomezIvann]

Currently, our design system includes standardized scroll styles, but they are not easily accessible for use within custom components or UI elements outside of the core system. To improve consistency and usability, we should export these scroll styles so that users can integrate them seamlessly into their components.

Use case

Users creating custom components (e.g., modal dialogs, dropdowns, or side panels) may want to apply the same scroll styles as the core components to maintain visual consistency across the application.

Proposed solution

• Export the scroll styles as CSS variables, mixins, or utility classes.
• Document how users can apply them to their custom components.

Other related issues

• Scroll bar Guidelines #848

[github-actions]

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