feat(fireworks): burst radial blanc al explotar enemic + tuning

source/game/systems/collision_system.cpp

@@ -76,6 +76,10 @@ namespace Systems::Collision {
                 Defaults::Physics::Debris::ENEMY_LIFETIME,
                 Defaults::Physics::Debris::ENEMY_FRICTION,
                 Defaults::Physics::Debris::ENEMY_SEGMENT_MULTIPLIER);
+
+            // Firework burst radial des del centro de l'enemic (efecte adicional al debris).
+            // No heretem color: el burst usa el blanc per defecte per a un feel més lluminós.
+            ctx.firework_manager.spawn(ENEMY_POS);
         }
     }  // anonymous namespace
 

source/game/systems/collision_system.hpp

@@ -19,6 +19,7 @@
 #include "core/defaults.hpp"
 #include "core/system/game_config.hpp"
 #include "game/effects/debris_manager.hpp"
+#include "game/effects/firework_manager.hpp"
 #include "game/effects/floating_score_manager.hpp"
 #include "game/entities/bullet.hpp"
 #include "game/entities/enemy.hpp"
@@ -36,6 +37,7 @@ namespace Systems::Collision {
         std::array<int, 2>& score_per_player;
         std::array<int, 2>& lives_per_player;
         Effects::DebrisManager& debris_manager;
+        Effects::FireworkManager& firework_manager;
         Effects::FloatingScoreManager& floating_score_manager;
         const GameConfig::MatchConfig& match_config;
         // Trigger de muerte del jugador (GameScene::tocado).