Add "distance from edge" setting for backdrops

Some of the players that use backdrops adjust their location and crop some of the image, which is also cropping the ratings. It would be great to be able to move the ratings a bit lower so it's visible. See for example Nuvio on Mac

<img width="1285" height="529" alt="Image" src="https://github.com/user-attachments/assets/ead7ff7b-23ce-4cb3-8d28-88deaf8697b3" />