feat(effects): heat-haze sinusoidal al fons del títol (configurable a ui.yaml)

source/game/scenes/title_scene.hpp

@@ -2,7 +2,9 @@
 
 #include <functional>
 #include <memory>
+#include <optional>
 
+#include "core/rendering/effects/heat_haze.hpp"
 #include "core/scene/scene.hpp"
 
 class Surface;
@@ -30,4 +32,5 @@ class TitleScene : public Scene {
     SceneFactory next_factory_;
     int timer_ms_;
     int blink_elapsed_ms_{0};
+    std::optional<Effects::HeatHaze> heat_haze_;
 };