MapEvents originalEvent type issue

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### mapbox-gl-js version

v3.15.0

### Expected behavior

The following MapEvents types has a optional `originalEvent` property:
- zoomstart
- zoom
- zoomend
- pitchstart
- pitch
- pitchend

### Actual behavior

The `originalEvent` inaccessible according to typescript.

Reason:
The listed events has a `| void` defined in the type.

Current:
```typescript
"zoomstart": {
originalEvent?: WheelEvent | TouchEvent;
} | void
```
Fixed:
```typescript
"zoomstart": {
originalEvent?: WheelEvent | TouchEvent;
}
```

### Steps to trigger the unexpected behavior

```typescript
const map = new mapboxgl.Map({ container: 'map' })
map.on('zoomstart', (e) => {
console.log(e.originalEvent) // <-- Type error
})
```

Start from the MapEvents type definitions for the listed zoom and pitch events and reproduce the TypeScript error with the callback shown in the issue. Update the event typing so the documented originalEvent property is accessible, then run the repository's type checks or relevant tests to confirm the callback compiles.

Written by the indexing model from the issue text.