fix(useScrollLock): correct scrollbarWidth calculation in widthReflow

[sabertobihwy]

Fixes incorrect scrollbar width calculation in widthReflow (used by useScrollLock).

The old implementation used scrollWidth, which returns the total scrollable width — even content that overflows. This made the scrollbar width calculation wrong in some cases.

Now it uses clientWidth, which gives the actual visible area (content + padding, excluding scrollbar), and the result is accurate.

[changeset-bot]

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Latest commit: 775b8da

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