split the selection panel into one card per kind of selection

src/ui/selection/DebrisContent.cpp

@@ -0,0 +1,30 @@
+#include "DebrisContent.h"
+
+#include <QLabel>
+#include <QVBoxLayout>
+
+#include "DebrisScrap.h"
+#include "Simulation.h"
+
+DebrisContent::DebrisContent(const SelectionContext& context,
+                             const SelectionRequest& request, QWidget* parent)
+    : SelectionContent(context, std::nullopt, parent)
+    , m_debris(request.debris)
+{
+    m_scrapLabel = new QLabel(this);
+    getRuntimeLayout()->addWidget(m_scrapLabel);
+
+    setIdentity(QPixmap(), tr("Debris"));
+    if (m_debris.size() > 1)
+    {
+        setCountSlot(static_cast<int>(m_debris.size()));
+    }
+}
+
+void DebrisContent::refreshRuntime()
+{
+    // The value falls as the debris is collected and as pieces despawn
+    // (REQ-UI-DEBRIS-CLICK-SELECT), so it is re-summed rather than remembered.
+    m_scrapLabel->setText(tr("Scrap remaining: %1")
+        .arg(sumDebrisScrap(getContext().sim->getAdmin(), m_debris)));
+}