双轴图Tooltip只显示其中一个数值

```

`${val}%`, nice: true },
}}>










```

Start by reproducing the supplied dual-axis Canvas/Chart example with Tooltip enabled, then trace tooltip behavior for the Interval and Line/Point series. Done means the tooltip displays both income and percentage values together while preserving the shown aliases and percentage formatter.

Written by the indexing model from the issue text.