Make sure website display matches game

[hackmud-dtr]

I.e. timestamp shouldn't have a colon. Add channel even when repetitive. Etc. This way artwork that lines up in-game also lines up in-browser

[empmud]

✅ Timestamp doesn't have a colon anymore
✅ Alignment could be obtained by adding the channel name

Would channel name visibility be a useful user setting, or should we just enable it everywhere?

Tempting to have a unified mode where all messages are mixed into a single div per user. (Oh, I see, you already raised that idea as #52)