6834
- Only supports channel-name search, per 6834. Channel-title search would probably be too heavy on the client side.
- Fuzzy search is possible, but is too slow on huge lists. Ended up with a simpler `matchSorter.rankings.CONTAINS`, which I think would cover typical cases.
Reason:
- With each list (Personal, Admin, Mod, Muted), there's a bunch of useEffects and variables needed to handle the state. All of them are doing 99% similar things.