show the available controls in a panel over the world

src/ui/MainWindow.cpp

@@ -29,6 +29,7 @@
 #include "SchematicChoiceDialog.h"
 #include "HeaderBar.h"
 #include "SelectionPanel.h"
+#include "ControlsPanel.h"
 #include "ShipLayoutBlueprintSerializer.h"
 #include "ShipLayoutDialog.h"
 #include "BuildingIconCache.h"
@@ -91,6 +92,11 @@ MainWindow::MainWindow(Simulation* sim, const std::string& configDir,
                                           m_itemIcons.get(), m_buildingIcons.get(),
                                           this);
 
+    // Floats at the world view's opposite edge from the selection panel and reads the
+    // world view for the player's current situation (REQ-UI-CONTROLS-PANEL). Built
+    // after the view for the same stacking reason as the panels above it.
+    m_controlsPanel = new ControlsPanel(m_gameWorldView, this);
+
     // Created last so it stacks above the other children; covers the whole window and
     // dims the game behind modal dialogs/menus (REQ-UI-MODAL-DIM).
     m_dimOverlay = new ModalDimOverlay(m_visuals.overlays.modalDim, this);
@@ -173,6 +179,10 @@ void MainWindow::layoutPanels()
     // move for it (REQ-UI-SELECTION-PANEL, REQ-UI-BUILD-BAR).
     m_selectionPanel->anchorTo(
         worldRect.adjusted(0, 0, 0, -m_buildButtonBar->getStripHeightPx()));
+    // Same band, opposite edge: left and bottom-aligned, so it clears the bar's strip
+    // too and never meets the selection panel (REQ-UI-CONTROLS-PANEL).
+    m_controlsPanel->anchorTo(
+        worldRect.adjusted(0, 0, 0, -m_buildButtonBar->getStripHeightPx()));
     m_dimOverlay->setGeometry(0, 0, totalW, totalH);
 }