feat(SegmentedControl): allow square display for icon items

[syeo66]

Summary

Adds an iconOnly prop to SegmentedControl.Item that renders the item as a square sized to match the control's height (36×36). Intended for items that contain only an icon,

API

<SegmentedControl.Root defaultValue="view">
    <SegmentedControl.Item value="view" iconOnly>
        <IconEye size={20} />
    </SegmentedControl.Item>
    <SegmentedControl.Item value="edit" iconOnly>
        <IconPen size={20} />
    </SegmentedControl.Item>
</SegmentedControl.Root>

[changeset-bot]

🦋 Changeset detected

Latest commit: d38eda5

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

This PR includes changesets to release 1 package

Name	Type
@frontify/fondue-components	Minor

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[github-actions]

Lead time: 4 hours, 54 minutes, 47 seconds (4.91 total hours) from first commit to close.
Review time: 0 seconds (0 total hours) from ready for review to close.

• First commit: 12.5.2026, 11:33:23.
• Ready for review: N/A.
• Closed: 12.5.2026, 16:28:10.