Draw selection outline around selected scrap

Ring each selected scrap pile in the standard selection-outline color,
just outside its rendered circle, alongside the building outlines in
drawSelectionHighlights (REQ-UI-SCRAP-CLICK-SELECT).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DZR44tA8sn4dPqDzAVXyps

src/ui/GameWorldView.cpp

@@ -1083,6 +1083,19 @@ void GameWorldView::drawSelectionHighlights(QPainter& painter)
         // Outline sits 1px outside the footprint (into adjacent tiles).
         painter.drawRect(rect->adjusted(-1, -1, 1, 1));
     }
+
+    // A ring around each selected scrap pile, sitting just outside the pile's
+    // rendered circle (radius tilePx()*0.2, matching drawScrap) (REQ-UI-SCRAP-CLICK-SELECT).
+    if (!m_selectedScrap.empty())
+    {
+        const qreal outlineRadius = static_cast<qreal>(tilePx() * 0.2f) + 3.0;
+        for (const ScrapInfo& scrap : m_sim->scraps().allScrapInfo())
+        {
+            if (std::find(m_selectedScrap.begin(), m_selectedScrap.end(), scrap.entity)
+                == m_selectedScrap.end()) { continue; }
+            painter.drawEllipse(worldToWidget(scrap.position), outlineRadius, outlineRadius);
+        }
+    }
 }
 
 void GameWorldView::drawCopyConfigFeedback(QPainter& painter)