feat: avoid using spin sleep unless focused

src/platform/desktop.rs

@@ -11,8 +11,12 @@ use crate::platform::Platform;
 pub struct DesktopPlatform;
 
 impl Platform for DesktopPlatform {
-    fn sleep(&self, duration: Duration) {
-        spin_sleep::sleep(duration);
+    fn sleep(&self, duration: Duration, focused: bool) {
+        if focused {
+            spin_sleep::sleep(duration);
+        } else {
+            std::thread::sleep(duration);
+        }
     }
 
     fn get_time(&self) -> f64 {

src/platform/emscripten.rs

@@ -11,7 +11,7 @@ use crate::platform::Platform;
 pub struct EmscriptenPlatform;
 
 impl Platform for EmscriptenPlatform {
-    fn sleep(&self, duration: Duration) {
+    fn sleep(&self, duration: Duration, _focused: bool) {
         unsafe {
             emscripten_sleep(duration.as_millis() as u32);
         }

src/platform/mod.rs

@@ -11,7 +11,7 @@ pub mod emscripten;
 /// Platform abstraction trait that defines cross-platform functionality.
 pub trait Platform {
     /// Sleep for the specified duration using platform-appropriate method.
-    fn sleep(&self, duration: Duration);
+    fn sleep(&self, duration: Duration, focused: bool);
 
     /// Get the current time in seconds since some reference point.
     /// This is available for future use in timing and performance monitoring.