[3.x] ComboBox positioner z-index doesn't work

[codercms]

Current Behavior

The ComboBox property positionerZIndex has no effect because it's applied to the positioner element, but @zagjs/popper expects custom z-index to be applied to the first child element of the positioner:
https://github.com/chakra-ui/zag/blob/9ca9b9edd448071351271465629024ecb1eb80be/packages/utilities/popper/src/get-placement.ts#L185

https://github.com/chakra-ui/zag/blob/9ca9b9edd448071351271465629024ecb1eb80be/packages/machines/combobox/src/combobox.connect.ts#L27

skeleton/packages/skeleton-svelte/src/lib/components/Combobox/Combobox.svelte

Line 126 in b1e64c4

<div {...api.getPositionerProps()} transition:fade={{ duration: 100 }} class="{positionerBase} {positionerZIndex} {positionerClasses}">

Expected Behavior

The positionerZIndex prop should be applied to the first child element of the positioner element, not to the positioner itself

Steps To Reproduce

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Link to Reproduction / Stackblitz

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More Information

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