feat(Select): Add <Select.Value/> component

[ieedan]

This PR introduces a <Select.Value/> component that allows users to create re-usable components using the value of the select.

You can use Select.Value in two different ways:

<!-- uses the label from the items list or the text content of the item node -->
<Select.Value/> 

<!-- use the child snippet for more control and to be able to set the value -->
<Select.Value>
  {#snippet child({ selection, placeholder, disabled })}
    <!-- ... -->
  {/snippet}
</Select.Value>

CleanShot.2026-04-15.at.09.23.04.mp4

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Latest commit: 7d23ab9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
bits-ui	Minor

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