fix(pin-input): focus first empty slot on empty-field click

[SergioChan]

Closes #2999

📝 Description

• update setFocusedIndex to route focus to the first empty pin slot when the clicked input is empty
• keep existing behavior for clicks on already-filled inputs

⛳️ Current behavior (updates)

• clicking an empty slot focuses that exact slot, even when earlier slots are still empty
• this can make keyboard entry start from the middle and leave earlier cells unfilled

🚀 New behavior

• clicking any empty slot now moves focus to the first empty slot in the group
• clicking a filled slot still focuses the clicked slot

💣 Is this a breaking change (Yes/No):

No

📝 Additional Information

Validated locally with:

• pnpm --filter @zag-js/pin-input lint
• pnpm --filter @zag-js/pin-input typecheck

[changeset-bot]

⚠️ No Changeset found

Latest commit: f37744f

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