ui: Adjust BoxShadow offset for elevation styles (#47010)

Changed the offset of shadow to improve shadow appearance. There was a
1px horizontal offset on all elevated surfaces — barely perceptible, but
once you see it, it's all you see

|Before|After|
|-|-|
|<img width="586" height="884" alt="before"
src="https://github.com/user-attachments/assets/63fa36a7-7845-4c6f-9e73-36ad5056194b"
/>|<img width="586" height="884" alt="after"
src="https://github.com/user-attachments/assets/41a032d3-e7d6-4188-9394-656d5caf822e"
/>|

Release Notes:

- N/A
a4ebfa0e7aIke committed on 1/19/2026, 2:17:44 PM· committed by GitHubparent5e2e917
1 file changedLine totals unavailable