remove the Shift copy-building-settings gesture

src/ui/GameWorldView.h

@@ -20,7 +20,6 @@
 
 #include "Blueprint.h"
 #include "BuildModeController.h"
-#include "BuildingConfig.h"
 #include "BlueprintModeExitedEvent.h"
 #include "BlueprintPlacementRequestedEvent.h"
 #include "BuilderModeExitedEvent.h"
@@ -217,12 +216,6 @@ private:
     // Enqueues placements and rotate-in-place commands for the resolved path.
     void                          applyBeltDragPath();
 
-    // Copy-settings gesture (REQ-BLD-COPY-CONFIG): Shift+right-click copies a
-    // building's configuration into m_copiedConfig; Shift+left-click applies it to
-    // another building of the same type via the existing configuration commands.
-    void     copyConfigFrom(BuildingId id);
-    void     pasteConfigTo(BuildingId id);
-
     // Turns the ghost and refreshes everything that depends on its facing: placement
     // validity, the tunnel completion match, and an in-progress belt drag's path.
     // The mode transitions themselves live on m_buildMode.
@@ -271,17 +264,6 @@ private:
     // and to resolve the tunnel ghost sub-tile (REQ-BLD-TUNNEL-MODE).
     QVector2D                            m_cursorWorldPos;
 
-    // Temporary cache for the copy-settings gesture (REQ-BLD-COPY-CONFIG); held
-    // only while Shift is down and cleared on Shift release.
-    std::optional<BuildingConfig> m_copiedConfig;
-
-    // Brief outline flash shown on a building when settings are copied from it or
-    // pasted onto it (REQ-BLD-COPY-CONFIG-FEEDBACK). remainingMs counts down in
-    // wall-clock time so the flash plays at a fixed length regardless of game speed
-    // (and while paused).
-    std::vector<CopyConfigFlash> m_copyConfigFlashes;
-    static constexpr qint64      kCopyFlashDurationMs = 300;
-
     bool     m_debugDraw;
 
     // Owns the selection across all three categories and the rules for moving