Layout Element Component's Min/Max fields can be set to the negative values which silently changes the property source to the default one

How to reproduce:
1. Create a new Unity project
2. In the Hierarchy, right-click -> UI (Canvas) -> Text (TextMeshPro)
3. In the Inspector, click Add Component -> Layout Element
4. Set the Min Width to -1
5. Observe the results

Expected results: The field can't be set to a negative value
Actual results: The field can be set to a negative value and source of the value in the "Layout Properties" changes to the default source

Reproducible with: 6000.6.0a6, 6000.6.0a7
Not reproducible with with: 6000.0.76f1, 6000.3.15f1, 6000.4.8f1, 6000.5.0b9, 6000.6.0a5

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

Note: Prior to 6000.6.0a6 versions have only Min fields available