Cache activities, quotes, etc. for when the internet connection fails

[stickyPiston]

For some reason the radio goes completely blank when the internet connection goes out, and it does not resume when the connection is up again.

[peppidesu]

this would also likely solve or mostly mitigate #183

[peppidesu]

i have looked into this, and it would be nice if we could use RTK query's built-in cache, but that will require some stunts

[peppidesu]

@stickyPiston we could make a custom hook that falls back on the RTK query cache when the request fails. The only problem then is that the cache will be invalidated when the component unmounts, so we'll need to set keepUnusedDataFor to a high value (which might not be desirable). What is your take on this?