Improve feed handling and generators
Use per-feed query keys (["feed", feed]) and update invalidation to
include the feed URI. Add feedUrisAtom and feedGeneratorUriAtom and
populate feed URIs from the feed generators API; set the selected
generator URI when a category is clicked. Make feed item rendering safer
(data?.map), adjust avatar/handle layout, and add a tooltip for
formatted dates. Fix genre string to "rap metal". Bump ramda and
@types/ramda and update bun.lock accordingly.