ref(ui): Add ellipsize string helper

[gggritso]

Was surprised that this helper doesn't exist? Maybe it does, but somewhere I didn't see it? Anyway I added a new one, y'all let me know what you want to call this thing, and if all the behaviour makes sense.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

✅ All tests successful. No failed tests found.

Additional details and impacted files

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[gggritso]

@JonasBa thanks for the suggestions, accepted 🙏🏻 I also futzed a bit with the truncation behaviour, after thinking about it for a while. In short, I think it's acceptable to trimEnd the string before ellipsizing because the ellipsis is already hiding information that was removed via truncation. But I think all-whitespace strings should be exempt from that, since in that case trimEnd removes all information. Open to other opinions!