Add notification toasts/sonner

[zaknesler]

Should be in the style of Sonner.

The most important here is "refreshing feeds (X of Y)" which automatically increments. Ideally this'll work with the following webhook notifications (received in order):

• RefreshingFeeds: feed_uuids
• Each feed: RefreshedFeed: feed_uuid

Can create a simple state machine to count when we've refreshed all the feeds, and then can update the same toast popup with the number of feeds as they get created. Then, once all feeds are refreshed, we can invalidate the local queries. It might also be worth it to update the feeds on a timeout while we are refreshing so that we

1. Update the list as the feeds are refreshing, in case we have many feeds to refresh and it takes a few seconds
2. Don't invalidate the stats/feeds/entries more than we have to (doing it for each feed would be way too many API calls).