Sheet corner radius uses a fixed value instead of a token

[vitorvlopes]

Describe the bug

The Sheet component’s corner radius is set as a hardcoded numeric value (e.g., 8) instead of being bound to a radius design token/variable.

What libraries are you seeing the problem on?

Mobile Library

Steps to reproduce

1. Locate the Sheet component.
2. Select the Sheet surface/container layer.
3. In the right panel, check Corner radius.
4. Notice the radius is a fixed value.

Expected behavior

The Sheet container/surface corner radius should be bound to the appropriate radius token (container) instead of a raw value, following the design system standard.