corregit: flags estatics en credits.cpp i title.cpp

source/sections/credits.h

@@ -65,6 +65,20 @@ class Credits {
         int initial_volume_ = Options::audio.music.volume;  // Volumen inicial
         int steps_ = 0;                                     // Pasos para reducir audio
 
+        // --- Estado de acumuladores para animaciones ---
+        struct CreditsState {
+            float texture_accumulator = 0.0f;
+            float balloon_accumulator = 0.0f;
+            float powerball_accumulator = 0.0f;
+            float black_rect_accumulator = 0.0f;
+            float r = 255.0f;  // UPPER_LIMIT
+            float g = 0.0f;    // LOWER_LIMIT
+            float b = 0.0f;    // LOWER_LIMIT
+            float step_r = -0.5f;
+            float step_g = 0.3f;
+            float step_b = 0.1f;
+        } credits_state_;
+
         // --- Rectángulos de renderizado ---
         // Texto de créditos
         SDL_FRect credits_rect_src_ = param.game.game_area.rect;