Bestiary pictures the right way up (PNG export writes rows bottom up)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/gfx.rs

@@ -2007,7 +2007,8 @@ mod doc_images {
         for y in 0..h {
             for x in 0..w {
                 let p = img.get_pixel(src.x as u32 + x / scale, src.y as u32 + y / scale);
-                out.set_pixel(x, y, p);
+                // export_png writes the rows bottom up: store them flipped
+                out.set_pixel(x, h - 1 - y, p);
             }
         }
         out.export_png(path);