Slider no longer "jumps" between defined steps, but makes smooth transitions with iOS 26.

## Environment

* Slider v5.x with the new architecture.
* iOS 26 used for the repro.

## Description

With the iOS 26 the behavior of native Slider changed. Beside having the liquid glass applied the slide movement is now smooth between defined steps, while it should be consistent with what was before v26 - Slider should make visible "jumps" between defined steps.

## Reproducible Demo

Any Slider instance with `step` defined will do to repro.

先使用新架构和一个已定义的步长启动 Slider v5.x 实例，然后在 iOS 26 上复现该行为。将平滑移动与 issue 中描述的 iOS 26 之前的行为进行比较。完成的标准是：在 iOS 上，已定义的步长再次产生可见的跳变，同时现有的 Slider 行为保持不变。

由索引模型根据 Issue 内容生成。