The Ragdoll Builder window has no minimum window size for the critical functionality to be visible at all times

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Open the Ragdoll Builder window (GameObject > 3D Object > Ragdoll)
3. Resize the Ragdoll Builder window to be as small as possible
4. Observe the Ragdoll Builder window

Actual results: The Ragdoll Builder has no minimum size set, allowing to be resized into a tiny window in which none of the window functionality is visible

Expected results: The Ragdoll Builder has a minimum window size set so that the most important functionality remains visible

Reproducible with versions: 2023.1.0a3, 6000.0.73f1, 6000.3.13f1, 6000.4.3f1, 6000.5.0b4, 6000.6.0a3

Tested on (OS): MacOS Silicon Tahoe 26.3