The calm Gmail twin: unread is weight, never a badge count; sources are tinted dots; undo is real — the op only sends when the window closes.
unread thread in the personal mailbox (its tint)
read + starred, work mailbox (second tint, amber star)
one mailbox: the dot means unread, primary
thread body loading
No badge counts, no priority tabs — unread is WEIGHT, sources are tinted dots, stars are amber. Archive and trash hide the thread instantly and show a 5s undo; the server op is only sent when the window closes, so the journal records what actually happened.