Use the proper logic on iOS to increment the badge (#4233)

src/lib/notifications/notifications.ts

@@ -7,6 +7,7 @@ import {logger} from '#/logger'
 import {SessionAccount, useAgent, useSession} from '#/state/session'
 import {logEvent, useGate} from 'lib/statsig/statsig'
 import {devicePlatform, isNative} from 'platform/detection'
+import BackgroundNotificationHandler from '../../../modules/expo-background-notification-handler'
 
 const SERVICE_DID = (serviceUrl?: string) =>
   serviceUrl?.includes('staging')
@@ -108,19 +109,20 @@ export function useRequestNotificationsPermission() {
   }
 }
 
-export async function decrementBadgeCount(by: number | 'reset' = 1) {
+export async function decrementBadgeCount(by: number) {
   if (!isNative) return
 
-  const currCount = await getBadgeCountAsync()
-
-  if (by === 'reset') {
-    await setBadgeCountAsync(0)
-    return
+  let count = await getBadgeCountAsync()
+  count -= by
+  if (count < 0) {
+    count = 0
   }
 
-  let newCount = currCount - by
-  if (newCount < 0) {
-    newCount = 0
-  }
-  await setBadgeCountAsync(newCount)
+  await BackgroundNotificationHandler.setBadgeCountAsync(count)
+  await setBadgeCountAsync(count)
+}
+
+export async function resetBadgeCount() {
+  await BackgroundNotificationHandler.setBadgeCountAsync(0)
+  await setBadgeCountAsync(0)
 }

src/state/queries/notifications/unread.tsx

@@ -11,7 +11,7 @@ import BroadcastChannel from '#/lib/broadcast'
 import {logger} from '#/logger'
 import {useMutedThreads} from '#/state/muted-threads'
 import {useAgent, useSession} from '#/state/session'
-import {decrementBadgeCount} from 'lib/notifications/notifications'
+import {resetBadgeCount} from 'lib/notifications/notifications'
 import {useModerationOpts} from '../../preferences/moderation-opts'
 import {truncateAndInvalidate} from '../util'
 import {RQKEY as RQKEY_NOTIFS} from './feed'
@@ -119,7 +119,7 @@ export function Provider({children}: React.PropsWithChildren<{}>) {
         // update & broadcast
         setNumUnread('')
         broadcast.postMessage({event: ''})
-        decrementBadgeCount('reset')
+        resetBadgeCount()
       },
 
       async checkUnread({