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How the banner behaves at each level.
| Level | At | Tone | What the user sees |
|---|---|---|---|
| warn75 | ≥ 75% | amber | Usage line + special-price upgrade link |
| warn90 | ≥ 90% | red | Same, plus "you're almost out of space" |
| full | ≥ 100% | red | Inbound held, returned to sender after 24h. Outbound stays open. |
Dismissing the banner hides it for this session only. It comes back on the next sign-in while the account is still over the threshold — that is server-side, not a client trick.