Re-land taffy 0.8.3 (#34939)

Re #34938
- **chore: Bump taffy to 0.8.3**
- **editor: Fix sticky multi-buffer header not extending to the full
width**


Release Notes:

- N/A
3da23cc65bPiotr Osiewicz committed on 7/23/2025, 10:33:43 PM· committed by GitHubparentb63d820
5 files changedLine totals unavailable