Crop hero video to center Prism sculpture in frame

Cropped 1280x720 around the sculpture center, scaled back to
1920x1080. Object now centered in the video itself.

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

public/index.html

@@ -115,7 +115,7 @@
             min-height: 100%;
             transform: translate(-50%, -50%);
             object-fit: cover;
-            object-position: 35% 40%;
+            object-position: center center;
             z-index: 0;
         }