Line-chart dots collide when many series are shown

### Describe the bug

In line charts, the data point dots and value labels overlap/stack at the right edge if there are many lines. Some markers become unreadable

### To Reproduce

1. Create a question with several aggregations.

### Expected behavior

There's enough room for all dots to coexist normally

### Logs

_No response_

### Information about your Metabase installation

```JSON
- v1.56.8.3-x01
```

### Severity

p3

### Additional context

_No response_

Reproduce the issue by creating a question with several aggregations and inspect the resulting line chart at the right edge. Trace the chart rendering entry point responsible for markers and value labels, then verify that all dots and labels remain readable when many series are displayed.

Written by the indexing model from the issue text.