Stalwart's JMAP EventSource only pushes StateChange for the session's *primary*
account — a background change in a shared/delegated (secondary) account is never
pushed — so the shared folder's counters, and the unified/All-Mail badge that
aggregates them, went stale until a full reload. (Other *login* accounts already
update live because each login has its own SSE.)
Extend the client's state poll to every account in the session:
- buildStatePollingRequest emits a Mailbox/Email `get` per account, with the
accountId encoded in the callId (`mbx:<id>` / `eml:<id>`);
- checkForStateChanges / fetchCurrentStates key polling state per account and
report a per-account `changed` map, which handleStateChange already treats as
"some mailbox changed" and refetches the full (own + delegated) mailbox list
from — the badge is a live projection over that list;
- a slow (20s) secondary-account poll runs alongside SSE (paused while hidden)
so shared counters stay current between focus events.
Stefan Hildebrandt
bc11450f3f