autoScroll causes continuous flickering when dragging to the right or bottom edge of a scrollable container

## Description

When `autoScroll` is enabled, continuously dragging an item toward the right or bottom edge of a scrollable container (keeping the pointer in the auto-scroll activation zone) causes noticeable **flickering / jitter**.

## Steps to reproduce

1. Open the official example: https://tanstack.com/table/v8/docs/framework/react/examples/column-dnd
2. Start dragging any column header
3. Move the pointer to the right (or bottom) edge of the scrollable area and hold it there to trigger continuous auto-scrolling
4. Observe the flickering during the scroll

Reproduction: https://tanstack.com/table/v8/docs/framework/react/examples/column-dnd
(Reproducible on the latest versions)

## Expected behavior

Auto-scrolling should be smooth without any visual flickering or jitter while dragging.

## Actual behavior

- Continuous flickering occurs when auto-scrolling to the right or downward
- The flickering persists as long as auto-scroll is active
- Setting `autoScroll={false}` completely eliminates the issue

## Environment

- `@dnd-kit/core`: ^6.3.1
- `@dnd-kit/sortable`: ^10.0.0
- `@dnd-kit/utilities`: ^3.2.2
- `@tanstack/react-table`: ^8.21.3
- Browser:
- OS:

## Additional context

This issue is particularly noticeable in table column reordering scenarios where the container has horizontal overflow.

Start with the official column-dnd example and reproduce the issue with autoScroll enabled while dragging to the right or bottom edge. Trace the auto-scroll behavior used by the example and compare it with autoScroll={false}; done means continuous edge scrolling is smooth without flickering or jitter.

Written by the indexing model from the issue text.