Thanks @chimnayajith for picking this up!

These changes look pretty clean, so I'm hopeful this can be finished and merged without too much further work. And the feature is something we've heard requests for from users.

So although we're generally focusing on launch issues now, and this issue is post-launch, I think this PR can be one of the exceptions which we continue work on.

One thing it'll need before we give it a detailed review, though: some tests are failing, which you'll need to fix.

@gnprice Fixed the failing tests. Please take a look.

Great, thanks. The next stage for this PR will be maintainer review:
https://zulip.readthedocs.io/en/latest/contributing/review-process.html#stages-of-a-pull-request-review

Maintainers will prioritize reviewing PRs for launch issues, so this one might sit idle for a while at times. Similarly, on your end please prioritize launch issues.

The thing you can do to help expedite this PR is to occasionally reread it while bearing in mind feedback you've gotten on other PRs, and try to spot places where similar feedback would apply. Then you can revise it accordingly, which will simplify later review.

Quoting from #1178

In the future this item will be replaced: #1037
but that may be post-launch, and this odd icon-less gap should be fixed before launch. Adding an icon here is trivial, once we pick an icon for it.

Should I remove the switch account option in the main menu as part of this PR?