bugfix(partitioning): Correct cell world coordinate calculation for overlap checks

[seer-by-sentry]

Fixes CLIENT-4ES. The issue was that: Incorrect world-to-cell coordinate conversion in doCircleFillPrecise causes COI array overflow, leading to memory corruption and access violation during iteration.

• The calculation for cellWorldX and cellWorldY was updated to correctly determine the lower-left corner of a cell.
• Previously, x * cellSize and y * cellSize were used, which did not account for the world extents offset.
• Now, ThePartitionManager->getCellCenterPos is used to get the cell's center, which correctly considers m_worldExtents.lo.
• halfCellSize is then subtracted from the cell's center coordinates to derive the lower-left corner, aligning with the expectations of doesCircleOverlapCell.

This fix was generated by Seer in Sentry, triggered automatically. 👁️ Run ID: 13741494

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