IBX-10758: Overflow list

[GrabowskiM]

🎫 Issue	IBX-10758

Description:

For QA:

Documentation:

[Copilot]

Pull Request Overview

This PR introduces an overflow list component for the Ibexa Design System Storybook. The component provides a reusable UI pattern for displaying lists that can collapse items when space is limited, showing a "+N" indicator for hidden items.

Key Changes

• Added a new Twig template for the overflow list Storybook story
• Implemented styling for the overflow list component with wrapper and item borders

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}