CommentContainer:threaded with long usernames on mobile display

Build 7069 on ab/discussion-spacing
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Build 7069c1dab17
Current build. There are unaccepted changes, so build 6911 is still the baseline.
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Build 6787db61566
Accepted by Charlotte Emms.
Build 5728fd4f18e
Accepted by Sophie.
Build 56246145aac
Accepted by Sophie.
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