fix(player): remove the leaked window "blur" listener in useNativeControlsYield

The native-controls-yield effect registered addEventListener("blur", onBlur) but its
cleanup removed "blur-sm" (a stray Tailwind-class find-replace artifact), so the blur
listener was never removed — leaking one per player open/close. Match the names.

frontend/src/lib/playerModalHooks.ts

@@ -198,7 +198,7 @@ export function useNativeControlsYield({
     window.addEventListener("focus", rearm);
     stage?.addEventListener("mouseleave", rearm);
     return () => {
-      window.removeEventListener("blur-sm", onBlur);
+      window.removeEventListener("blur", onBlur);
       window.removeEventListener("focus", rearm);
       stage?.removeEventListener("mouseleave", rearm);
     };