Out-of-range opacity values are accepted without warning when applied through UI Toolkit USS

Steps to reproduce:

1. Open the attached “IN-146325” project
2. Open Assets/Scenes/SampleScene
3. Enter Play mode
4. Observe the second row with opacity examples: “Runtime case: parent gets class .game-menu-visible with opacity: 100”
5. Observe the Console

Actual result: Opacity: 100 is accepted without warning and affects child opacity
Expected result: Unity warns about or clamps opacity values outside [0, 1]

Reproducible with: 6000.0.0f1, 6000.0.79f1, 6000.3.19f1, 6000.5.4f1, 6000.6.0b3, 6000.7.0a2

Reproducible on: Windows 11
Not reproducible on: No other environments tested