[Notifications] Add a Mentions tab (#7044)

* Split out NotificationsTab

* Remove unused route parameter

* Refine the split between components

* Hoist some logic out of NotificationFeed

* Remove unused option

* Add all|conversations to query, hardcode "all"

* Add a Conversations tab

* Rename to Mentions

* Bump packages

* Rename fields

* Fix oopsie

* Simplify header

* Track active tab

* Fix types

* Separate logic for tabs

* Better border for first unread

* Highlight unread for all only

* Fix spinner races

* Fix fetchPage races

* Fix bottom bar border being obscured by glimmer

* Remember last tab within the session

* One tab at a time

* Fix TS

* Handle all RQKEY usages

* Nit

src/screens/Settings/NotificationSettings.tsx

@@ -18,7 +18,13 @@ type Props = NativeStackScreenProps<AllNavigatorParams, 'NotificationSettings'>
 export function NotificationSettingsScreen({}: Props) {
   const {_} = useLingui()
 
-  const {data, isError: isQueryError, refetch} = useNotificationFeedQuery()
+  const {
+    data,
+    isError: isQueryError,
+    refetch,
+  } = useNotificationFeedQuery({
+    filter: 'all',
+  })
   const serverPriority = data?.pages.at(0)?.priority
 
   const {