split the selection panel into one card per kind of selection

src/ui/selection/StorageContent.cpp

@@ -0,0 +1,29 @@
+#include "StorageContent.h"
+
+#include "Building.h"
+#include "BuildingTarget.h"
+#include "SelectionNames.h"
+
+StorageContent::StorageContent(const SelectionContext& context,
+                               const SelectionRequest& request, QWidget* parent)
+    : BufferedBuildingContent(context, request.buildings.front(), parent)
+{
+}
+
+void StorageContent::refreshConfiguration()
+{
+    const BuildingTarget target = resolveBuildingTarget(getContext(), getBuildingId());
+    if (!target.isValid())
+    {
+        return;
+    }
+    setBuildingIdentity(target.type, getBuildingTypeName(target.type));
+}
+
+BufferedBuildingContent::CycleInfo StorageContent::getCycleInfo(
+    const Building& /*building*/) const
+{
+    // No recipe, no cycle: the card shows the output buffer alone, with no per-cycle
+    // denominators to show it against (REQ-BLD-SALVAGE-BAY).
+    return CycleInfo();
+}