split the selection panel into one card per kind of selection

src/ui/selection/ShipContent.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include "entt/entity/entity.hpp"
+
+#include "SelectionContent.h"
+#include "SelectionContentFactory.h"
+
+class ShipStatsPanel;
+
+// The card for one selected ship (REQ-UI-SHIP-STATS-PANEL): its live hull stats and the
+// summaries of the capability modules it carries, computed from what is actually
+// installed (REQ-MOD-STAT-CALC). Applies to player and enemy ships alike
+// (REQ-UI-ENTITY-CLICK-SELECT).
+class ShipContent : public SelectionContent
+{
+    Q_OBJECT
+
+public:
+    ShipContent(const SelectionContext& context, const SelectionRequest& request,
+                QWidget* parent = nullptr);
+
+protected:
+    void refreshRuntime() override;
+
+private:
+    entt::entity    m_entity;
+    ShipStatsPanel* m_statsPanel;
+};