Reduce web requests (#2420)

* Stop auto-refetching app passwords and invites on an interval

* Don't poll for posts or notifs if the app/tab isnt focused

src/state/queries/post-feed.ts

@@ -1,4 +1,5 @@
 import React, {useCallback, useEffect, useRef} from 'react'
+import {AppState} from 'react-native'
 import {AppBskyFeedDefs, AppBskyFeedPost, PostModeration} from '@atproto/api'
 import {
   useInfiniteQuery,
@@ -312,6 +313,9 @@ export async function pollLatest(page: FeedPage | undefined) {
   if (!page) {
     return false
   }
+  if (AppState.currentState !== 'active') {
+    return
+  }
 
   logger.debug('usePostFeedQuery: pollLatest')
   const post = await page.api.peekLatest()