* PageView ballistics overshoot the page on some devices

On some devices, such as Cupertino “Plus”-sized devices, scrolling left on the first page of a PageView will overshoot the first page and land on the second page.

The issue is that applyContentDimensions incorrectly detects a content size change due to a floating point comparison on certain screen sizes (18257.400000000005 vs 18257.4)

To fix this, perform a nearEqual comparison in applyContentDimensions.

* Apply style changes to nearEqual for code review feedback.