[Bug] Zoom Reset Count Incorrect After Multiple Grids Zoom

### Version

6.1.0

### Link to Minimal Reproduction

https://echarts.apache.org/examples/en/editor.html?c=grid-multiple

### Steps to Reproduce

1. Zoom in once on the upper trend chart.
2. Zoom in once on the lower trend chart.
3. You have now performed 2 zoom operations in total.
4. Click Zoom Reset. It can be triggered 3 times, which is incorrect.

### Current Behavior

Zoom Reset can be triggered 3 times, which indicates an error in how zoom history is tracked across multiple grids.

### Expected Behavior

Zoom Reset should only be available as many times as actual zoom operations were performed.
In this case, after 2 zooms, Zoom Reset should only be possible 2 times.

### Environment

```markdown
- OS:N/A
- Browser: N/A
- Framework: N/A

This issue can be reduced with Echarts Demo Examples. The issue is independent of my development environment or the browser used in testing.
```

### Any additional comments?

_No response_

Start with the linked grid-multiple ECharts reproduction and trace how zoom operations and Zoom Reset history are recorded across the upper and lower trend charts. Verify the two-zoom sequence and identify why reset is available three times; done means two zooms allow exactly two resets, with regression coverage for multiple grids.

Written by the indexing model from the issue text.