feat(ui): add box selection feature

- Selection: add addAll() method for bulk shape addition
- Controller: box selection with mouse drag on empty space
- ShapeDraftman: drawSelectionBox() for rubber-band rendering
- ShapesView: currentSelectionBox field and setter

src/main/java/ovh/gasser/newshapes/ui/ShapesView.java

@@ -13,6 +13,7 @@ public class ShapesView extends JPanel {
     private final Controller controller;
     private ShapeVisitor draftman;
     private boolean resizeMode;
+    private Rectangle currentSelectionBox;
 
     public ShapesView(SCollection model) {
         this.model = model;
@@ -25,6 +26,7 @@ public class ShapesView extends JPanel {
         this.draftman = new ShapeDraftman(g);
         ((ShapeDraftman) this.draftman).setResizeMode(resizeMode);
         model.accept(draftman);
+        ((ShapeDraftman) this.draftman).drawSelectionBox(currentSelectionBox);
     }
 
     public Controller getController() {
@@ -38,4 +40,8 @@ public class ShapesView extends JPanel {
     public void setResizeMode(boolean resizeMode) {
         this.resizeMode = resizeMode;
     }
+
+    public void setCurrentSelectionBox(Rectangle box) {
+        this.currentSelectionBox = box;
+    }
 }