[refactor] rework cell navigation code

[severo]

• fix focus action on a cell (use an effect, not a ref callback, so that it is not called only on mount)
• recreate the cell navigation context on new data (key) to simplify the code
• handle the cell navigation implementation in cell navigation provider, instead of in the table keyboard event handler
• simplify state changes during rendering (even if they are still problematic because they update parent components, which is not allowed in React rules)

[Copilot]

Pull request overview

This pull request refactors the cell navigation code to use an action-based API instead of direct cell updates, and improves the component remounting mechanism.

Changes:

• Replaced goToCell function with moveCell that accepts action objects (e.g., { type: 'NEXT_ROW' })
• Changed from dataId prop to React's key prop for component remounting when data changes
• Refactored cell focusing to use useEffect with refs instead of ref callbacks

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
test/providers/CellNavigationProvider.test.tsx	Updated tests to use new moveCell API and removed dataId prop usage
src/providers/CellNavigationProvider.tsx	Implemented moveCell with action-based navigation, removed dataId tracking, added numRowsPerPage prop
src/hooks/useCellFocus.ts	Changed focusCellIfNeeded to focusIfNeeded using useMemo, updated to use moveCell
src/contexts/CellNavigationContext.ts	Added MoveCellAction type definition and updated context interface
src/components/TableCorner/TableCorner.tsx	Refactored to use useEffect for focusing instead of ref callback
src/components/RowHeader/RowHeader.tsx	Refactored to use useEffect for focusing instead of ref callback
src/components/HighTable/Slice.tsx	Updated keyboard navigation to use moveCell actions, removed numRowsPerPage parameter
src/components/HighTable/HighTable.tsx	Changed to pass numRowsPerPage to CellNavigationProvider and use key={dataId}
src/components/ColumnHeader/ColumnHeader.tsx	Refactored to use useEffect for focusing instead of ref callback
src/components/Cell/Cell.tsx	Refactored to use useEffect for focusing instead of ref callback

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