Tasks

1. Show/hide contact details on hover

Hint using state and a callback, not CSS.

2. ⭐ Add ability to filter contacts by name

3. ⭐ Add button that keeps the contact expanded

4. ⭐ Filter by all fields, not just name

5. ⭐ Make filtering case insensitive

6. 🔥 Add button that sorts contacts by name; clicking the button should toggle sort direction

7. 🔥 Add an icon the the button (↑/↓) to indicate sorting direction.