This commit adds an example with deep children hierarchy.
The depth of a tree can be tweaked with GPUI_TREE_DEPTH env variable.
With depth=100
<img width="301" height="330" alt="image"
src="https://github.com/user-attachments/assets/844cd285-c5f3-4410-a74e-981bf093ba2e"
/>
With this example, I can trigger a stack overflow at depth=633 (and
higher).


Release Notes:

- N/A