feat(title): destell hiperespacial al VP quan la nau desapareix (sparkle 4-puntes còncau)

source/game/scenes/title_scene.hpp

@@ -63,6 +63,20 @@ class TitleScene final : public Scene {
     std::unique_ptr<Graphics::Camera3D> camera_;
     std::unique_ptr<Graphics::Starfield> starfield_;
     std::unique_ptr<Title::ShipAnimator> ship_animator_;
+
+    // Destell que tapa el "pop" final de cada nau quan arriba al VP.
+    // Pool fix de 2 (una per nau). Anima escala 0→max→0.
+    struct Flash {
+        Vec2 position{};
+        float timer{0.0F};
+        bool active{false};
+    };
+    std::array<Flash, 2> flashes_{};
+    std::shared_ptr<Graphics::Shape> flash_shape_;
+
+    void triggerFlash(Vec2 pos);
+    void updateFlashes(float delta_time);
+    void drawFlashes();
     TitleState estat_actual_{TitleState::STARFIELD_FADE_IN};
     float temps_acumulat_{0.0F};