No feedback to user about running simulations or their ending

I've got a simulation running now. After I clicked "simulate", I think I did get a "running simulation" timer initially, but it seems to have gone now, so I'm back to the screen with the "simulate" button:

There's nothing here to tell me if the simulation has finished (I assume it didn't because the screen changes to the one with plots when that does), or if the simulation has failed. I think it's still running---app.log still hasn't got anything after this:

2023-07-13 16:38:20,175|root|DEBUG - ComponentSync disconnecting from simConfig.cvode_active
2023-07-13 16:44:14,958|root|INFO - Scheduling simulation on 1 cores with  ...
2023-07-13 16:44:14,963|root|DEBUG - Running single core simulation

but there's no way to tell. As a user, I don't know what to do---should I wait more, should I click simulate again, should I start again from scratch?

La issue no nombra archivos fuente ni tests. Rastrea la acción simulate, su estado de temporizador en ejecución, la transición a plots y los mensajes de app.log; estará terminado cuando la UI distinga claramente entre los estados en ejecución, finalizado y fallido, e indique al usuario qué debe hacer.