Upgrade to integration example to reka-ui

## Description

Upgrade "Integration" example to [reka-ui](https://reka-ui.com).

<img width="671" height="357" alt="Image" src="https://github.com/user-attachments/assets/3c973b5c-7890-4ad7-9965-d180f354207d" />

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Shouldn't be too hard - I would like to submit a PR soon 👍 