843e3c1ef restored a recency grace window (60 s) for append messages:
messages newer than connectedAtMs - 60 s are still forwarded to
onMessage so genuinely recent offline arrivals trigger auto-reply.
The test 'handles append messages by marking them read but skipping
auto-reply' used nowSeconds() as the message timestamp, which falls
inside the grace window and therefore reaches onMessage — contradicting
the expect(onMessage).not.toHaveBeenCalled() assertion.
Fix: use nowSeconds(-120_000) (2 minutes before now) so the message is
clearly outside the grace window and the append-recency filter correctly
skips it.
b182845b80