chore(engine): apply rustfmt after dead-code removals

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

solitaire_engine/src/card_animation/animation.rs

@@ -283,5 +283,4 @@ mod tests {
             .with_z_lift(12.0);
         assert!((anim.z_lift - 12.0).abs() < 1e-6);
     }
-
 }

solitaire_engine/src/card_animation/timing.rs

@@ -126,5 +126,4 @@ mod tests {
             "micro_vary should differ for different indices"
         );
     }
-
 }