dillon1000/react

[DevTools] Give a distinct color to the root (#34690)

Stacked on #34654.

The root is special since it represents "Initial Paint" (or a
"Transition" when an Activity is selected). This gives it a different
color in the timeline as well as gives it an outline that's clickable.
Hovering the timeline now shows "Initial Paint" or "Suspense".

Also made the cursor a pointer to invite you to try to click things and
some rounded corners.

<img width="1219" height="420" alt="Screenshot 2025-10-02 at 1 26 38 PM"
src="https://github.com/user-attachments/assets/12451f93-8917-4f3b-8f01-930129e5fc13"
/>

<img width="1217" height="419" alt="Screenshot 2025-10-02 at 1 26 54 PM"
src="https://github.com/user-attachments/assets/02b5e94c-3fbe-488d-b0f2-225b73578608"
/>

<img width="1215" height="419" alt="Screenshot 2025-10-02 at 1 27 24 PM"
src="https://github.com/user-attachments/assets/c24e8861-e74a-4ccc-8643-ee9d04bef43c"
/>

<img width="1216" height="419" alt="Screenshot 2025-10-02 at 1 27 10 PM"
src="https://github.com/user-attachments/assets/d5cc2b62-fa64-41bf-b485-116b1cd67467"
/>