Auto-open layout dialog when a new shipyard schematic is selected

Implement REQ-MOD-UI-AUTO-DIALOG: picking a new schematic for a shipyard
via the manual selection dialog now opens the layout configuration dialog
immediately. Only triggers on an actual schematic change; copy-settings
and blueprint placement are unaffected.

Extract the ShipLayoutDialog-opening logic into a reusable
MainWindow::openShipLayoutDialog helper. Because SetRecipeCommand is
queued and clears the layout, the auto-open passes the chosen schematic
and an empty layout explicitly rather than reading stale building state.

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

src/ui/MainWindow.h

@@ -15,6 +15,7 @@
 #include "WinEvent.h"
 #include "RecipeSelectionRequestedEvent.h"
 #include "SchematicChoicesAvailableEvent.h"
+#include "ShipLayout.h"
 #include "ShipLayoutBlueprint.h"
 #include "Tick.h"
 #include "VisualsConfig.h"
@@ -57,6 +58,12 @@ private:
     void handleEvent(std::shared_ptr<const EscapeMenuRequestedEvent> event) override;
     void handleEvent(std::shared_ptr<const LayoutDialogRequestedEvent> event) override;
     void handleEvent(std::shared_ptr<const RecipeSelectionRequestedEvent> event) override;
+
+    // Opens the shipyard layout configuration dialog for the given schematic and
+    // current layout, applying the result via SetShipLayoutCommand (REQ-MOD-UI-DIALOG).
+    void openShipLayoutDialog(BuildingId shipyardId,
+                              const std::string& schematicId,
+                              const ShipLayoutConfig& currentLayout);
     void layoutPanels();
 
 private: