When the zoom level high, `autoCenter: true` stops working correctly

## Bug description
When the zoom level is set higher than 500 px/sec, the Wavesurfer options `autoCenter: true` (with `autoScroll` enabled) stop working correctly. The playhead cursor drifts towards the right edge of the container and then triggers scrolling; it no longer remains centered during playback.

## Environment
- **Wavesurfer.js version:** 7.9.9  