Would love to be able to search my notifications for any text or a specific @ handle
free text search would be best
as the search for usernames at the top of the site is restrictive when you can't remember the exact first few letters of a username but can remember a word the user has in their account name

also an indicator to show that a filter is currently active - just the words "filter active" next to notifications would be good
as I still forget when I've applied a filter and think I've missed notifications lol :-)

additionally would be nice to have a timeline or "jump to past day" as suggested 
here https://auxo.dev/o/diamond/p/7