69b25254

By: Michael Lynch <git@mtlynch.io>

Simplify mediaDisplayImages: remove redundant fields and dead code

- Remove int fields that just mirrored known constants
- Remove unused DisplaySize() method
- Lift ThumbnailSizes() to a package-level var (no instance state)
- Replace loop+switch in mediaDisplayImagesFor with direct calls

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>