message: Implement `Widget::mouse_interaction` for `image::Viewer`
diff: @@ -281,6 +281,24 @@ where
  }
  }
  + fn mouse_interaction(
  + &self,
  + layout: Layout<'_>,
  + _viewport: &Rectangle,
  + cursor_position: Point,
  + ) -> mouse::Interaction {
  + let bounds = layout.bounds();
  + let is_mouse_over = bounds.contains(cursor_position);
  +
  + if self.state.is_cursor_grabbed() {
  + mouse::Interaction::Grabbing
  + } else if is_mouse_over {
  + mouse::Interaction::Grab
  + } else {
  + mouse::Interaction::Idle
  + }
  + }
  +
  fn draw(
  &self,
  renderer: &mut Renderer,
  