feat(debris): modelo INTACTO→MENGUANDO→0 (sin pop, fade-out por tamaño)

source/game/effects/debris_manager.hpp

@@ -48,7 +48,7 @@ namespace Effects {
             float factor_herencia_visual = 0.0F,
             const std::string& sound = Defaults::Sound::EXPLOSION,
             SDL_Color color = {0, 0, 0, 0},  // alpha==0 → fragmentos usan oscilador global
-            float lifetime = Defaults::Physics::Debris::TEMPS_VIDA,
+            float lifetime = Defaults::Physics::Debris::INTACT_TIME,
             float friction = Defaults::Physics::Debris::ACCELERACIO,
             int segment_multiplier = 1);