[refactor] don't call scrollTo in native mode

[severo]

We already scroll to the current cell using scrollIntoView() when focusing it. No need to do the job twice.

On the contrary, when using the virtual scroll, we need to operate in two steps:

1. scroll vertically to the low-precision scrollTop, so that the current row is in the viewport
2. once done (isScrolling === false), we use scrollIntoView to scroll horizontally

We cannot use scrollIntoView for point 1. because the new scrollTop would not be aligned with the computed state.

[Copilot]

Pull request overview

This PR refactors the native scroll mode to eliminate redundant scrolling operations. Instead of using both scrollTo() and scrollIntoView(), the native mode now relies solely on scrollIntoView() for scrolling to cells, while the virtual scroll mode continues to use scrollTo() for low-precision vertical scrolling followed by scrollIntoView() for horizontal scrolling.

Changes:

• Removed scrollTo state and setScrollTo from ScrollModeNativeProvider
• Modified scrollRowIntoView in native mode to update scrollTop state instead of calling scrollTo()
• Added headerHeight parameter to ScrollModeNativeProvider to correctly calculate scroll positions
• Enhanced documentation in useCellFocus explaining the preventScroll usage

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/providers/ScrollModeProvider.tsx	Passes headerHeight prop to ScrollModeNativeProvider
src/providers/ScrollModeNativeProvider.tsx	Removes scrollTo mechanism and uses state-based scrolling instead
src/hooks/useCellFocus.ts	Adds preventScroll option and improves documentation

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