[refactor] Prepare native/virtual scroll mode - virtual mode is not implemented

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[Copilot]

Pull request overview

This PR introduces alternate scroll mode calculations to support rendering very large dataframes. The key innovation is detecting when the table height would exceed browser DOM element height limits (approximately 8-33 million pixels depending on browser) and switching to a "virtual scroll" mode.

• Refactored scroll logic from the Scroller component into dedicated provider components (ScrollModeProvider, ScrollModeNativeProvider, ScrollModeVirtualProvider)
• Introduced a new ScrollModeContext to replace ScrollerContext, consolidating scroll-related functionality
• Optimized setVisibleRowsRange to avoid unnecessary re-renders by comparing field values instead of object references

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/providers/ScrollModeProvider.tsx	New provider that determines whether to use native or virtual scroll mode based on table height
src/providers/ScrollModeVirtualProvider.tsx	New provider implementing virtual scroll mode (currently shows error as not fully implemented)
src/providers/ScrollModeNativeProvider.tsx	New provider implementing native browser scroll mode, extracted from Scroller component
src/contexts/ScrollModeContext.ts	New context replacing ScrollerContext with expanded scroll mode functionality
src/contexts/ScrollerContext.ts	Removed and replaced by ScrollModeContext
src/providers/RowsAndColumnsProvider.tsx	Optimized setVisibleRowsRange callback to prevent unnecessary re-renders
src/components/HighTable/Scroller.tsx	Refactored to use ScrollModeContext instead of containing scroll logic
src/components/HighTable/Wrapper.tsx	Updated to integrate ScrollModeProvider and move constants imports
src/components/HighTable/Slice.tsx	Updated to use ScrollModeContext instead of ScrollerContext
src/hooks/useCellFocus.ts	Added conditional logic to handle virtual scroll mode differently
src/helpers/constants.ts	Added maxElementHeight constant and moved constants from HighTable directory
src/components/HighTable/HighTable.stories.tsx	Added LargeData and SmallData stories to test different scroll modes
README.md	Clarified padding parameter documentation

Comments suppressed due to low confidence (1)

src/helpers/constants.ts:14

• The reference URL contains a future date (2025/08/07). As of January 2026, this date would be in the past, but it appears to be fictional since today is January 2, 2026 and the date is in August 2025. Please verify this URL actually exists or update to the correct reference URL.

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