Consider automatically refreshing after state changes

[Aran-Fey]

Currently, the GUI is only updated after an event handler returns or when force_refresh() is called. It would arguably be more intuitive if state changes automatically triggered a refresh (say with a delay of 100ms or so).

One potential problem with this is that a component might be rebuilt while it's in an inconsistent state. However, that can only happen if the user's code has an await statement in the middle.