msglist: Long-press on invalid link crashes the app

[chrisbobbe]

https://chat.zulip.org/#narrow/stream/48-mobile/topic/long-press.20on.20invalid.20link.20crashes.20RN.20app/near/1776020

We got a report from rust-lang that any invalid link (e.g. [something](not a valid link)) crashes the React Native app upon longpress. Both the reporter and I are on Android, so I can't verify if it also affects iOS.

I've reproduced the issue on Android—and indeed also on iOS.

We should catch the error from the URL parser.

I wouldn't have expected errors in the long-press handler to actually crash the app; that is puzzling. And in a debug build, the symptom is different—the app doesn't crash; it just shows a dismissable red error screen. Anyway, we want to catch and handle the error, since servers' expected behavior includes producing an href that doesn't parse.