1. Sampling optimization: reduce from 20 to 12 images when exceeding threshold
2. Native image width normalization: re-crop page-width strips for consistent stitching
- Preserves original native images for MinIO storage
- Uses normalized versions only for thumbnail stitching
3. Low fallback threshold: stitch full page screenshots when 3 fallback images
- Deduplicates and limits to max 3 pages
- Provides better context for sparse thumbnails