Add CSS variables for scrollbar overflow calculations in scroll area component

[2hu12]

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📝 Description

This PR introduces CSS variables to the ⁠scroll-area component, inspired by the design principles of ⁠base-ui/scroll-area. These variables are useful for implementing features such as scroll edge gradient masks, enhancing the visual appeal and functionality of the scroll area.

⛳️ Current behavior (updates)

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🚀 New behavior

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💣 Is this a breaking change (Yes/No): No

📝 Additional Information

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Latest commit: e2b2959

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