Launch-time tasks

[gnprice]

This is an issue for recording things we'll want to do around the time of launching the app to GA (replacing the legacy zulip-mobile app), and that we'd otherwise be at risk of forgetting.

• Switch app icons to the non-"beta" versions → tracked separately, as Switch app icons to non-"beta" versions #1537
• Update the names seen in /stats (currently "Mobile app (React Native)" and "Mobile app beta (Flutter)"): #api design > zulip-flutter in analytics client chart @ 💬
  → analytics: Update labels for mobile apps for Flutter launch. zulip#34849
• Update the Help Center for changes to the app (try to think of things; also look through open post-launch issues for things that are features in the legacy app; also grep through the Help Center source for "mobile" tabs)
  → tracked as Update help center for new Flutter app zulip#34748
• Reset ratings and reviews in the App Store and Play Store
  → rather, reset ratings in the App Store; reviews persist, and the Play Store automatically downweights old ratings over time rather than offer a similar reset feature.
• (There'll be lots of other things to do too; we'll fill out a list of them more fully when the launch gets closer. For now this is only to track things we think of now and feel we should write down in order not to forget.)

[gnprice]

The launch is imminent; and the tasks above are all done! (Or at least prepared, with the final deploy steps tracked on short-term checklists.)