- Add watchJmapPush(accountId, password) to EmailRepository; IMAP and
JMAP-without-push return Stream.empty() so callers fall through to polling
- EmailRepositoryImpl opens an SSE (text/event-stream) connection to the
server's eventSourceUrl; yields void on each StateChange event; properly
cancellable via StreamController.onCancel
- _JmapAccountSync._wait() subscribes to watchJmapPush and races it against
the 30 s poll timer and the stop signal — whichever fires first unblocks
the next sync cycle
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
