float the build buttons as a horizontal bar over the game world and show key bindings inside build buttons

src/ui/GameWorldView.cpp

@@ -332,7 +332,7 @@ void GameWorldView::onFrame()
         }
 
         // Unlocked building set changes only after a drop is applied or on Restart
-        // (REQ-LOCK-BUILDING); the build grid rebuilds its visible buttons.
+        // (REQ-LOCK-BUILDING); the build bar rebuilds its visible buttons.
         int newUnlockedBuildingCount = 0;
         for (const BuildingDef& def : m_sim->getConfig().buildings.buildings)
         {