UI Builder "Padding" field can be set to a negative value

How to reproduce:
1. Create a new Unity project
2. Create a UI Document and open it
3. Create any Visual Element
4. In the UI Builder Inspector, Go to Spacing -> Padding
5. Try setting the value to a negative number

Expected results: The Padding can't be set to a negative number because it has no effect
Actual results: The Padding can be set to a negative number

Reproducible with: 6000.0.63f1, 6000.2.14f1, 6000.3.0b10, 6000.4.0a5, 6000.5.0a2

Reproducible on: macOS Tahoe 26 (M1)
Not reproducible on: No other environment tested