Summary

Adds a clear-selection affordance to Event Deltas and ensures clearing selection resets both the comparison mode and the heatmap's visual selection overlay.

What's included

• DBDeltaChart
  • Adds onClearSelection callback prop
  • Shows IconX clear button in legend while selection is active
• DBSearchHeatmapChart
  • Wires clear action to reset xMin/xMax/yMin/yMax
  • Uses a clearSelectionVersion signal for chart-side visual reset
  • Ensures table filter actions also trigger selection clear
• DBHeatmapChart
  • Accepts clearSelectionVersion
  • Clears local selection UI and persisted uPlot selection rectangle when clear is triggered

Follow-up CI fix

• Removed a duplicate clearSelection declaration introduced during branch consolidation, which caused TypeScript/lint failures.

How to test

1. In Event Deltas, drag to select an area on the heatmap.
2. Confirm distribution switches to Selection/Background mode and clear (X) is visible.
3. Click clear (X) or apply include/exclude from a distribution bar.
4. Confirm:
   • selection coordinates are cleared
   • distribution returns to all spans mode
   • heatmap visual selection rectangle/popover is cleared

References

• Linear: HDX-3693

Linear Issue: HDX-3693