Expand the clickable area of the homepage cluster capacity chart toggle button to match its hover area

[jeffery021121]

Describe the bug (描述bug)
The current hover area and click area of the cluster capacity chart toggle button on the homepage are inconsistent, with the click area being too small

To Reproduce (复现方法)
To reproduce the issue, simply hover over or click on the icon button

Expected behavior (期望行为)
Expand the clickable area of the button to match its hover area.

Additional context/screenshots (更多上下文/截图)

[Seanium]

Hi, please assign this issue to me.