fix(toast): implement drag_destinations

src/widget/toaster/widget.rs

@@ -160,6 +160,21 @@ where
             ))
         }
     }
+
+    fn drag_destinations(
+        &self,
+        state: &Tree,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+        dnd_rectangles: &mut iced_style::core::clipboard::DndDestinationRectangles,
+    ) {
+        self.content.as_widget().drag_destinations(
+            &state.children[0],
+            layout,
+            renderer,
+            dnd_rectangles,
+        );
+    }
 }
 
 struct ToasterOverlay<'a, 'b, Message, Theme = iced::Theme, Renderer = iced::Renderer> {