[DevTools] Use pretty icon with icon for unique suspenders toggle (#34625)

Stacked on #34624.

<img width="638" height="170" alt="Screenshot 2025-09-27 at 12 57 10 PM"
src="https://github.com/user-attachments/assets/f67023b1-e7be-4252-93ab-6302bc63ac26"
/>
<img width="641" height="250" alt="Screenshot 2025-09-27 at 12 57 21 PM"
src="https://github.com/user-attachments/assets/f96a9b48-c6f4-406f-a0ea-b3da288411b5"
/>