fix: only offer scheduled-send times the server accepts

Stalwart advertises `maxDelayedSend` as a fixed 30 days, but its MTA
rejects any hold beyond its `futureRelease` limit, 7 days by default.
Now that scheduled send works on Stalwart, a time 8 to 30 days ahead
passed the checks and then failed with the raw "501 5.5.4 Requested
hold time exceeds maximum of 604800 seconds" reply.

Ported from the webmail:
- on Stalwart the advertised 30 days count as 7
- a submission or reschedule refused for its hold time throws
  `ScheduleTooLateError`, and the limit it names replaces the advertised
  one for that server
- the composer and the Scheduled screen show "Too far ahead" for it
  instead of the SMTP reply

The composer's and the Scheduled screen's presets now only list times
within the limit, and the undo-send hold, from the composer and from
quick reply, is capped at it.

src/components/email/QuickReplyBox.tsx

@@ -90,7 +90,7 @@ export function QuickReplyBox({ email, jmapAccountId, onMoreOptions, onSent }: P
         },
         identity.id,
         sent.originalId ?? sent.id,
-        sendDelaySeconds > 0 && jmapClient.hasDelayedSend(jmapAccountId) ? sendDelaySeconds : undefined,
+        jmapClient.undoSendHold(sendDelaySeconds, jmapAccountId),
         { draftsMailboxId: drafts ? (drafts.originalId ?? drafts.id) : undefined, accountId: jmapAccountId },
       );
       try {