fix(dataZoom): keep slider handle label visible when mouse stays over handle after drag end

[waterWang]

Fixes #20178

Problem

When dragging a dataZoom slider handle and releasing the mouse without moving it away (i.e. the mouse stays over the handle), the handle's label disappears even though the pointer is still over the handle.

Root cause

During a drag, the handle's onmouseout can fire (the pointer briefly leaves the handle hit area as it moves), which sets SliderZoomView._isOverDataInfoTriggerArea = false. On dragend, _onDragEnd() checks that flag and, because it is false, calls _showDataInfo(false) which hides the label — even though the mouse is still sitting over the handle.

Fix

Accept the dragend event in _onDragEnd(e). When the flag is false, only hide the label if the drag did not end on a handle or the move zone. If the drag released over a handle / move zone, keep the label visible so it matches the "mouse is still over the handle" expectation.

This also forwards the event from _onActualMoveZoneDragEnd so the move-zone drag path behaves the same way.

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