perf: double animation start delay for helicopters to stagger timing

src/main.rs

@@ -457,7 +457,7 @@ fn main() {
 
                 // Animate and update multiple helicopters
                 for (i, root) in heli_roots.iter_mut().enumerate() {
-                    let time_offset = elapsed + (i as f32) * 0.5;
+                    let time_offset = elapsed + (i as f32) * 1.0;
                     let heading = simple_heading_animation(time_offset);
                     {
                         let mut pin = root.as_mut();