🐛Bug: Slider Thumb does not SSR

[alexbjorlig]

Describe the bug
The Slider Thumb does not SSR, so it flickers on load.

To Reproduce
See this link.

Expected behavior
No flicker.

Screenshots

slider.thumb.ssr.issue.mp4

[TGlide]

Curiously enough, Radix UI has the same issue. I do think we should try and solve it though, thanks for raising this.

[TGlide]

Managed to fix it for a single thumb: https://stg.radix-svelte.com/docs/slider

Still need to figure out multiple thumbs. The issue is that svelte actions don't work on SSR, which is understandable. Will have to find a new way to approach it!