fix(sync): derive mobile sync from current state so it resumes after backgrounding

.changeset/fix-background-sync-resume.md

@@ -0,0 +1,5 @@
+---
+default: patch
+---
+
+Fix new messages not arriving on mobile until the app was restarted, after it had been in the background.

src/app/features/settings/notifications/UnifiedPushNotifications.ts

@@ -1193,7 +1193,7 @@ export async function listenForUnifiedPushMessages(getSettings: () => Notificati
   const listener = await addPluginListener('notifications', 'push-message', (data: unknown) => {
     const notification = parseUnifiedPushMessage(data);
     if (!notification) return;
-    getSlidingSyncManager(getSettings().mx)?.resumeForPush();
+    getSlidingSyncManager(getSettings().mx)?.requestPushDrain();
     dispatch(notification);
   });