I think this could be expanded to also apply the setting in other open tabs by leveraging thestorage event:

https://developer.mozilla.org/en-US/docs/Web/API/Window/storage_event

I guess a small storage helper module is needed to abstract this out of the file and be useful for all localStorage-backed variables.

I've added the bare minimum to get the setting working across tabs too. There's probably an opportunity to abstract into somelocalStorage module suitable for more similar localStorage-backed settings, but I'm not totally certain how to design it.

web_src/js/modules/storage.ts is now contains minimallocalStorage wrapper functions and I've used them everywhere where we previously usedlocalStorage directly (except inline scripts, but that's another topic to be solved via web components). This is in preparation so that these settings can be synced to the server in the future.