feat: add option "end" to the slider's origin property

[danieledler]

Closes #2236

📝 Description

The slider has an origin property that sets the start position of the filled track for single values. It currently includes "start" and "center" but misses an "end" option.

An "end" option is useful in scenarios where the slider value functions as a threshold to include values above it. Then it might make more sense to have the track filled from the thumb to the end rather than from the start to the thumb.

⛳️ Current behavior (updates)

Now the origin property has option "start" (default) and "center". For the "start" value, the track is filled from start (left in LTR contexts, right in RTL contexts) to the thumb. For "center", the track is filled from the center (50%) to the thumb.

🚀 New behavior

This PR adds the origin option "end" to the slider.

This PR also explains effect of this property more clearly.

💣 Is this a breaking change (Yes/No):

No

[changeset-bot]

⚠️ No Changeset found

Latest commit: b1aa780

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[danieledler]

I can't commit a changelog due to missing submodule zag-plus?

After running npx @changesets/cli I got a file .changeset/five-donkeys-complain.md with the following content

---
"@zag-js/slider": minor
---

Add option 'end' to slider origin.

However, I could not commit this change. Git returns an error because it can't find the submodule examples/next-ts/pages/compositions.

In the repo, compositions links to https://github.com/chakra-ui/zag-plus which doesn't exist. How to proceed?