getInteractiveLegendEvents onLegendClick not called with ChartBar in ChartStack + ChartAxis

从 getInteractiveLegendEvents 以及 ChartBar、ChartStack 或 ChartGroup 和 ChartAxis 使用的 Chart 事件分发路径开始。复现最小示例，将其与正常工作的 ChartArea 和未包装的 ChartBar 案例进行比较，然后验证在存在 ChartAxis 时，onLegendClick 是否会对两种 wrapper 类型都触发。

Description

getInteractiveLegendEvents's onLegendClick callback is never invoked when ChartBar components are wrapped in ChartStack (or ChartGroup) alongside ChartAxis. The same setup with ChartArea instead of ChartBar works correctly.

Steps to reproduce

1. Create a Chart with ChartAxis, ChartBar inside a ChartStack, and a ChartLegend
2. Pass getInteractiveLegendEvents({ chartNames, legendName, onLegendClick }) to Chart's events prop
3. Click a legend item
4. onLegendClick is never called

Minimal reproduction

<Chart
    events={getInteractiveLegendEvents({
        chartNames: [['bar-0'], ['bar-1'], ['bar-2']],
        isHidden,
        legendName: 'legend',
        onLegendClick: handleLegendClick,
    })}
    legendComponent={<ChartLegend name="legend" data={legendData} />}
    containerComponent={<ChartContainer />}
>
    <ChartAxis />
    <ChartAxis dependentAxis />
    <ChartStack>
        <ChartBar name="bar-0" data={data[0]} />
        <ChartBar name="bar-1" data={data[1]} />
        <ChartBar name="bar-2" data={data[2]} />
    </ChartStack>
</Chart>

Full repro: https://github.com/sachaudh/pf-legend-click-repro

What works vs what doesn't

All three ingredients are required to trigger the bug: ChartBar, a ChartStack/ChartGroup wrapper, and ChartAxis.

Workaround

Apply click events directly to ChartLegend's events prop instead of relying on Chart-level event dispatch:

const legendClickEvents = [
    { target: 'data', eventHandlers: { onClick: handleClick } },
    { target: 'labels', eventHandlers: { onClick: handleClick } },
];

<ChartLegend name="legend" data={legendData} events={legendClickEvents} />

Affected version

@patternfly/react-charts v8.4.1, Victory v37.3.6

Jira Issue: PF-3666