feat(transitions): mosaic dissolve fade-out al final de la fase STARTING (configurable a ui.yaml)

source/game/scenes/title_scene.hpp

@@ -6,6 +6,7 @@
 #include <optional>
 
 #include "core/rendering/effects/heat_haze.hpp"
+#include "core/rendering/transitions/mosaic.hpp"
 #include "core/scene/scene.hpp"
 #include "game/debug_config.hpp"
 
@@ -51,4 +52,5 @@ class TitleScene : public Scene {
     Phase phase_{Phase::IDLE};
     int starting_timer_ms_{0};
     DebugConfig::StartingPlayers pending_players_{DebugConfig::StartingPlayers::BOTH};
+    std::optional<Transitions::Mosaic> fade_out_;
 };