This PR implements color changing for the scrollbar component based upon
user mouse interaction.


https://github.com/user-attachments/assets/2fd14e2d-cc5c-4272-906e-bd39bfb007e4


This PR also already adds the state for a scrollbar being actively
dragged. However, as themes currently do not provide a color for this
scenario, this implementation re-uses the hover color as a placeholder
instead. If this feature is at all wanted, I can quickly open up a
follow-up PR which adds support for that property to themes as well as
this component.

Release Notes:

- Added hover state to scrollbars outside of the editor.