dillon1000/react

[DevTools] Larger panel buttons and center (#34619)

The panel icons are quite small. Especially compared to the equivalent
buttons elsewhere in Chrome DevTools that otherwise use the same icons.
This makes them a little bigger to make them similar size to our other
button icons.

They were also a bit off center. This centers them as well.

Before:

<img width="409" height="426" alt="Screenshot 2025-09-26 at 4 23 15 PM"
src="https://github.com/user-attachments/assets/4a5de032-e316-44ed-9424-8bccce00f0cd"
/>

After:

<img width="519" height="388" alt="Screenshot 2025-09-26 at 4 22 57 PM"
src="https://github.com/user-attachments/assets/1763e522-5683-4fac-a913-27910a30a039"
/>