The implementation of Hybrid Cell Pooling (#8992) broke cell-based selection models because Neo.grid.Body#getCellId returns transient "pooled" IDs (e.g., ...__cell-4) instead of stable "logical" IDs (e.g., ...__firstname). CellModel relies on stable IDs for state persistence and navigation.

Tasks:

1. Update Neo.grid.Body#getCellId to always return the logical ID (rowId__dataField).
2. Update Neo.grid.Body#getDataField to correctly resolve dataField from pooled cell IDs using mountedColumns.
3. Update Neo.grid.Row#applyRendererOutput to use the logical ID for selection state checks (selectedCells.includes(logicalId)), while preserving the pooled ID for the DOM attribute.