He tornat a deixar el progres del fondo que fa tope en la ultima fase, no en el final del joc

source/stage.cpp

@@ -243,6 +243,18 @@ auto StageManager::getTotalPowerNeededToCompleteGame() const -> int {
     return total_power_needed;
 }
 
+auto StageManager::getPowerNeededToReachStage(size_t target_stage_index) const -> int {
+    if (!validateStageIndex(target_stage_index)) {
+        return 0;
+    }
+    
+    int power_needed = 0;
+    for (size_t i = 0; i < target_stage_index; ++i) {
+        power_needed += stages_[i].getPowerToComplete();
+    }
+    return power_needed;
+}
+
 // Implementación de la interfaz IStageInfo
 auto StageManager::canCollectPower() const -> bool {
     return power_collection_state_ == PowerCollectionState::ENABLED;