feat(ship): la nau entra a HURT al xocar amb un enemic, mor en un segon impacte

source/game/entities/ship.cpp

@@ -10,6 +10,7 @@
 #include <cstdint>
 #include <iostream>
 
+#include "core/audio/audio.hpp"
 #include "core/defaults.hpp"
 #include "core/entities/entity.hpp"
 #include "core/graphics/shape_loader.hpp"
@@ -62,6 +63,8 @@ void Ship::init(const Vec2* spawn_point, bool activar_invulnerabilitat) {
     // Activar invulnerabilidad solo si es respawn
     invulnerable_timer_ = activar_invulnerabilitat ? Defaults::Ship::INVULNERABILITY_DURATION : 0.0F;
     is_hit_ = false;
+    hurt_timer_ = 0.0F;
+    touching_enemy_prev_frame_ = false;
 }
 
 void Ship::processInput(float delta_time, uint8_t player_id) {
@@ -115,6 +118,12 @@ void Ship::update(float delta_time) {
         invulnerable_timer_ = std::max(invulnerable_timer_, 0.0F);
     }
 
+    // Decrementar timer d'estat HURT (a 0 → torna a normal sense efecte extern)
+    if (hurt_timer_ > 0.0F) {
+        hurt_timer_ -= delta_time;
+        hurt_timer_ = std::max(hurt_timer_, 0.0F);
+    }
+
     // El movimiento real lo hace PhysicsWorld::update().
     // Aquí solo lógica de estado.
 
@@ -157,5 +166,21 @@ void Ship::draw() const {
     const float VISUAL_PUSH = SPEED / Defaults::Ship::VISUAL_PUSH_DIVISOR;
     const float SCALE = 1.0F + (VISUAL_PUSH / Defaults::Ship::VISUAL_SCALE_DIVISOR);
 
-    Rendering::renderShape(renderer_, shape_, center_, angle_, SCALE, 1.0F, brightness_, Defaults::Palette::SHIP);
+    // Parpelleig daurat mentre està ferida: alterna color normal ↔ color hurt
+    // a Hurt::BLINK_HZ (mateixa estètica que el wounded dels enemics).
+    SDL_Color color = color_normal_;
+    if (hurt_timer_ > 0.0F) {
+        const float CYCLE = 1.0F / Defaults::Ship::Hurt::BLINK_HZ;
+        const float T = std::fmod(hurt_timer_, CYCLE);
+        if (T < (CYCLE / 2.0F)) {
+            color = color_hurt_;
+        }
+    }
+
+    Rendering::renderShape(renderer_, shape_, center_, angle_, SCALE, 1.0F, brightness_, color);
+}
+
+void Ship::herir() {
+    hurt_timer_ = Defaults::Ship::Hurt::DURATION;
+    Audio::get()->playSound(Defaults::Sound::HIT, Audio::Group::GAME);
 }