feat: format 4th user screenshot to 1920x1080 gallery image (#107)

- user-gallery-4.png (from 1914x907 screenshot)
- Scaled to 1920x1080 with dark background, gold accent bar, branding
- Raw screenshot preserved

Generated with [Devin](https://devin.ai)

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: SunrisesIllNeverSee