feat: support svelte 5.16.0 class value

[calvo-jp]

Closes #

📝 Description

In Svelte 5.16.0, the class attribute accepts objects and arrays as values using clsx under the hood. This PR adds support for this feature. (code taken from clsx)

⛳️ Current behavior (updates)

Input:

mergeProps(
  {class: {class1: true}},
  {class: ['class2', 'class3', null, undefined]},
  {class: 'class4'},
  {class: {class5: false, class6: true}},
)

Output:

{ class: 'class3' }

🚀 New behavior

Input:

mergeProps(
  { class: null },
  { class: undefined },
  { class: ["class1", "class2", null, undefined] },
  { class: "class3" },
  { class: { class4: false, class5: true } },
)

Output:

{ class: 'class1 class2 class3 class5' }

💣 Is this a breaking change (Yes/No):

No

📝 Additional Information

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Latest commit: ee61e65

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Name	Status	Preview	Updated (UTC)
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[anubra266]

@calvo-jp It's probably better to make this change in the svelte adapter

https://github.com/chakra-ui/zag/blob/main/packages/frameworks/svelte/src/merge-props.ts

[calvo-jp]

@calvo-jp It's probably better to make this change in the svelte adapter

https://github.com/chakra-ui/zag/blob/main/packages/frameworks/svelte/src/merge-props.ts

Hi @anubra266. Will update my PR once I get back. Thank you!