Follow-up to https://github.com/zed-industries/zed/pull/49938: - Adding the gradient overlay in all states within the preview slot - Remove label from the "Full Screen" button to make it simpler and more minimal <img width="400" height="1182" alt="Screenshot 2026-02-24 at 7 59@2x" src="https://github.com/user-attachments/assets/3c30e2b2-a572-4438-8cd3-4879bf54fea0" /> Release Notes: - N/A