feat(grid): graella verda fosca de fons al playfield (16x8)

source/game/scenes/game_scene.cpp

@@ -30,7 +30,8 @@ GameScene::GameScene(SDLManager& sdl, SceneContext& context)
       firework_manager_(sdl.getRenderer()),
       floating_score_manager_(sdl.getRenderer()),
       trail_manager_(sdl.getRenderer()),
-      text_(sdl.getRenderer()) {
+      text_(sdl.getRenderer()),
+      playfield_grid_(sdl.getRenderer()) {
     // Recuperar configuración de match des del context
     match_config_ = context_.getMatchConfig();
 
@@ -595,6 +596,7 @@ void GameScene::drawInitHudState() {
 }
 
 void GameScene::drawLevelStartState() {
+    playfield_grid_.draw();
     drawMargins();
     trail_manager_.draw();
     drawActiveShipsAlive();
@@ -607,6 +609,7 @@ void GameScene::drawLevelStartState() {
 }
 
 void GameScene::drawPlayingState() {
+    playfield_grid_.draw();
     drawMargins();
     trail_manager_.draw();
     drawActiveShipsAlive();
@@ -619,6 +622,7 @@ void GameScene::drawPlayingState() {
 }
 
 void GameScene::drawLevelCompletedState() {
+    playfield_grid_.draw();
     drawMargins();
     trail_manager_.draw();
     drawActiveShipsAlive();

source/game/scenes/game_scene.hpp

@@ -8,6 +8,7 @@
 #include <memory>
 #include <string>
 
+#include "core/graphics/playfield_grid.hpp"
 #include "core/graphics/vector_text.hpp"
 #include "core/physics/physics_world.hpp"
 #include "core/rendering/sdl_manager.hpp"
@@ -80,6 +81,9 @@ class GameScene final : public Scene {
     // Text vectorial
     Graphics::VectorText text_;
 
+    // Grilla de fons del playfield
+    Graphics::PlayfieldGrid playfield_grid_;
+
     // [NEW] Stage system
     std::unique_ptr<StageSystem::StageSystemConfig> stage_config_;
     std::unique_ptr<StageSystem::StageManager> stage_manager_;