UI Builder’s Transition Animations Property value names are inconsistent, uppercase in the dropdown but lowercase when selected

Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Open the UI Builder window (Window > UI Toolkit > UI Builder)
3. Add a Text Field from the Library into the Viewport
4. Open the Transition Animations foldout in the Inspector
5. Open the Property dropdown
6. Observe the dropdown
7. Select any value from the Property dropdown
8. Observe the value in the Inspector

Actual results: Property value names are inconsistent, uppercase in the dropdown but lowercase when selected

Expected results: Property value names match whether selected or in dropdown

Reproducible with versions: 6000.0.71f1, 6000.3.11f1, 6000.4.1f1, 6000.5.0a9, 6000.6.0a1

Tested on (OS): MacOS Silicon Tahoe 26.3

Notes:

• Easing properties in the same Animation Transitions foldout have property values start uppercase both in dropdown and when selected