Priority notifications (#4798)

* new settings screen

* bring back the spinner

* add experimental language

* fix typo, change leading

* integrate priority notifications API

* update package

* use refetch instead of invalidateQueries

* fix read-after-write issue by polling for update

* add spinner for initial load

* rm onmutate, it's overcomplicated

* set error state eagerly

* Change language in description

Co-authored-by: Hailey <me@haileyok.com>

* prettier

* add `Toggle.Platform`

* extract out mutation hook + error state

* rm useless cache mutation

* disambiguate isError and isPending

* rm unused isError

---------

Co-authored-by: Samuel Newman <10959775+mozzius@users.noreply.github.com>
Co-authored-by: Hailey <me@haileyok.com>

src/state/queries/notifications/feed.ts

@@ -46,11 +46,14 @@ const PAGE_SIZE = 30
 type RQPageParam = string | undefined
 
 const RQKEY_ROOT = 'notification-feed'
-export function RQKEY() {
-  return [RQKEY_ROOT]
+export function RQKEY(priority?: false) {
+  return [RQKEY_ROOT, priority]
 }
 
-export function useNotificationFeedQuery(opts?: {enabled?: boolean}) {
+export function useNotificationFeedQuery(opts?: {
+  enabled?: boolean
+  overridePriorityNotifications?: boolean
+}) {
   const agent = useAgent()
   const queryClient = useQueryClient()
   const moderationOpts = useModerationOpts()
@@ -59,6 +62,10 @@ export function useNotificationFeedQuery(opts?: {enabled?: boolean}) {
   const lastPageCountRef = useRef(0)
   const gate = useGate()
 
+  // false: force showing all notifications
+  // undefined: let the server decide
+  const priority = opts?.overridePriorityNotifications ? false : undefined
+
   const query = useInfiniteQuery<
     FeedPage,
     Error,
@@ -67,7 +74,7 @@ export function useNotificationFeedQuery(opts?: {enabled?: boolean}) {
     RQPageParam
   >({
     staleTime: STALE.INFINITY,
-    queryKey: RQKEY(),
+    queryKey: RQKEY(priority),
     async queryFn({pageParam}: {pageParam: RQPageParam}) {
       let page
       if (!pageParam) {
@@ -75,17 +82,17 @@ export function useNotificationFeedQuery(opts?: {enabled?: boolean}) {
         page = unreads.getCachedUnreadPage()
       }
       if (!page) {
-        page = (
-          await fetchPage({
-            agent,
-            limit: PAGE_SIZE,
-            cursor: pageParam,
-            queryClient,
-            moderationOpts,
-            fetchAdditionalData: true,
-            shouldUngroupFollowBacks: () => gate('ungroup_follow_backs'),
-          })
-        ).page
+        const {page: fetchedPage} = await fetchPage({
+          agent,
+          limit: PAGE_SIZE,
+          cursor: pageParam,
+          queryClient,
+          moderationOpts,
+          fetchAdditionalData: true,
+          shouldUngroupFollowBacks: () => gate('ungroup_follow_backs'),
+          priority,
+        })
+        page = fetchedPage
       }
 
       // if the first page has an unread, mark all read