profile: Keep "current" local time current

[gnprice]

This will be a followup to #292, showing a user's current local time on their profile page.

It'd be good for that "current" local time to remain current as time advances. That way, if our user sets down the app and does something else, and then comes back some minutes or hours later, we're not showing them something that's untrue. (That's a bug that zulip-mobile currently has here, and that Zulip web has for the times in the "Recent conversations" screen.)

This is probably not real complicated; we just need the relevant widget to rebuild at the start of every minute.

Related issues

• msglist: Refresh msglist recipient-header date text periodically to respond to current-date change #891

[Komyyy]

#1318 keeps current time using Stream.

[gnprice]

Thanks @Komyyy for picking this up!

This issue has the M7 Future milestone, which means we're not going to have time to help move it forward within the next couple of months while we focus on getting the app launched. If you're interested in contributing to Zulip, I'd be glad for you to take a look through issues in the M5-a and M5 launch milestones and take on one of those.

[Komyyy]

Thanks, @gnprice
After I opened this draft PR, I will contribute to M5 issues.