`useResizeHandler` does not respond to container layout changes

Currently, useResizeHandler only responds to window.resize events.

This works when the browser viewport changes, but it does not cover layout changes that resize the plot without resizing the window.

For example, if a page contains a collapsible sidebar and a responsive plot in the same page, toggling the sidebar changes the space available to the plot, but no window.resize event is fired. The plot therefore keeps its previous size until Plotly.Plots.resize() is called manually.

Would it make sense for useResizeHandler to react to changes in the rendered plot element's size instead of only listening to window.resize?

One possible approach would be to use ResizeObserver when available, while keeping the existing window.resize listener as a fallback.

Comienza en la implementación de useResizeHandler y sigue cómo se suscribe actualmente a window.resize. Revisa las pruebas existentes sobre el manejo del redimensionamiento y, después, verifica que los cambios en el elemento de plot renderizado desencadenen el redimensionamiento, mientras el fallback de window.resize siga funcionando. El trabajo estará terminado cuando los cambios en un layout colapsable redimensionen el plot sin una llamada manual a Plotly.Plots.resize().