[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/state/queries/notifications/unread.tsx

@@ -2,7 +2,7 @@
  * A kind of companion API to ./feed.ts. See that file for more info.
  */
 
-import React from 'react'
+import React, {useRef} from 'react'
 import {AppState} from 'react-native'
 import {useQueryClient} from '@tanstack/react-query'
 import EventEmitter from 'eventemitter3'
@@ -105,6 +105,8 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
     }
   }, [setNumUnread])
 
+  const isFetchingRef = useRef(false)
+
   // create API
   const api = React.useMemo<ApiContext>(() => {
     return {
@@ -138,6 +140,12 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
             }
           }
 
+          if (isFetchingRef.current) {
+            return
+          }
+          // Do not move this without ensuring it gets a symmetrical reset in the finally block.
+          isFetchingRef.current = true
+
           // count
           const {page, indexedAt: lastIndexed} = await fetchPage({
             agent,
@@ -145,6 +153,7 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
             limit: 40,
             queryClient,
             moderationOpts,
+            reasons: [],
 
             // only fetch subjects when the page is going to be used
             // in the notifications query, otherwise skip it
@@ -174,11 +183,14 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
           // update & broadcast
           setNumUnread(unreadCountStr)
           if (invalidate) {
-            truncateAndInvalidate(queryClient, RQKEY_NOTIFS())
+            truncateAndInvalidate(queryClient, RQKEY_NOTIFS('all'))
+            truncateAndInvalidate(queryClient, RQKEY_NOTIFS('mentions'))
           }
           broadcast.postMessage({event: unreadCountStr})
         } catch (e) {
           logger.warn('Failed to check unread notifications', {error: e})
+        } finally {
+          isFetchingRef.current = false
         }
       },