fix: fix resize and dragging

- AbstractShape: make bounds protected for subclass access
- STriangle: refactor resize logic
- SCircle: refactor resize logic (preserves equal dimensions)
- SText: add reasonable default bounds for hit testing

src/main/java/ovh/gasser/newshapes/shapes/SCircle.java

@@ -22,28 +22,24 @@ public class SCircle extends AbstractShape {
 
     @Override
     public void resize(ResizeHandle handle, int dx, int dy) {
-        Rectangle bounds = getBounds();
-        int newWidth = bounds.width;
-        int newHeight = bounds.height;
-
-        switch (handle) {
-            case E, W -> newWidth += dx;
-            case N, S -> newHeight += dy;
-            case SE, NW -> {
-                newWidth += dx;
-                newHeight += dy;
-            }
-            case NE, SW -> {
-                newWidth += dx;
-                newHeight += dy;
-            }
-        }
-
+        int delta = Math.max(Math.abs(dx), Math.abs(dy));
+        
+        boolean shrink = switch (handle) {
+            case E, SE, NE -> dx < 0;
+            case W, SW, NW -> dx > 0;
+            case N, S -> dy < 0;
+            default -> false;
+        };
+        
+        int sizeChange = shrink ? -delta : delta;
+        int newWidth = bounds.width + sizeChange;
+        int newHeight = bounds.height + sizeChange;
+        
         if (newWidth < 2) newWidth = 2;
         if (newHeight < 2) newHeight = 2;
-
-        this.radius = Math.max(newWidth, newHeight) / 2;
-        bounds.setSize(this.radius * 2, this.radius * 2);
+        
+        bounds.setSize(newWidth, newHeight);
+        this.radius = Math.max(bounds.width, bounds.height) / 2;
     }
 
     @Override