fix belts were not drawn

src/lib/sim/BuildingSystem.cpp

@@ -656,6 +656,21 @@ std::vector<ConstructionSite> BuildingSystem::allSites() const
                                          m_constructionQueue.end());
 }
 
+std::vector<BuildingSystem::BeltTileInfo> BuildingSystem::allBeltTiles() const
+{
+    std::vector<BeltTileInfo> result;
+    result.reserve(m_beltEntities.size());
+    for (const std::map<EntityId, BeltEntry>::value_type& kv : m_beltEntities)
+    {
+        BeltTileInfo info;
+        info.id   = kv.first;
+        info.tile = kv.second.tile;
+        info.type = kv.second.type;
+        result.push_back(info);
+    }
+    return result;
+}
+
 bool BuildingSystem::isTileOccupied(QPoint tile) const
 {
     return m_tileOccupancy.count({tile.x(), tile.y()}) > 0;

src/lib/sim/BuildingSystem.h

@@ -55,10 +55,18 @@ public:
     void tickBeltPush();
 
     // -- Queries -------------------------------------------------------------
+    struct BeltTileInfo
+    {
+        EntityId     id;
+        QPoint       tile;
+        BuildingType type;  // Belt or Splitter
+    };
+
     const Building*           findBuilding(EntityId id)  const;
     const ConstructionSite*   findSite(EntityId id)      const;
     std::vector<Building>     allBuildings()             const;
     std::vector<ConstructionSite> allSites()             const;
+    std::vector<BeltTileInfo> allBeltTiles()             const;
     bool                      isTileOccupied(QPoint tile) const;
 
     // Find nearest operational building of the given type; nullptr if none.

src/ui/GameWorldView.cpp

@@ -518,6 +518,21 @@ void GameWorldView::drawBuildings(QPainter& painter)
         }
     }
 
+    // Belt and splitter tiles (stored separately from regular buildings)
+    for (const BuildingSystem::BeltTileInfo& info : m_sim->buildings().allBeltTiles())
+    {
+        const std::map<BuildingType, BuildingVisuals>::const_iterator it =
+            m_visuals->buildings.find(info.type);
+        if (it == m_visuals->buildings.end()) { continue; }
+        const BuildingVisuals& bv = it->second;
+
+        painter.setPen(Qt::NoPen);
+        painter.fillRect(tileRect(info.tile), bv.fill);
+        painter.setPen(QPen(bv.outline, 1));
+        painter.setBrush(Qt::NoBrush);
+        painter.drawRect(tileRect(info.tile));
+    }
+
     painter.setOpacity(0.5);
     for (const ConstructionSite& s : m_sim->buildings().allSites())
     {