feat: pause campaign batches on SMTP failure

webui/src/features/campaigns/ReviewSendPage.tsx

@@ -932,10 +932,11 @@ export default function ReviewSendPage({
       const sent = result.sent_count ?? 0;
       const failed = result.failed_count ?? 0;
       const unknown = result.outcome_unknown_count ?? 0;
+      const paused = result.paused_count ?? 0;
       setMessage(
         effectiveDryRun ?
         "i18n:govoplan-campaign.dry_run_finished_no_message_was_sent.c026c6cd" :
-        `Send finished. SMTP accepted ${String(sent)} message(s), failed ${String(failed)}, outcome unknown ${String(unknown)}.`
+        `Send finished. SMTP accepted ${String(sent)} message(s), failed ${String(failed)}, outcome unknown ${String(unknown)}, paused ${String(paused)}.`
       );
       setSendConfirmOpen(false);
       await reload();
@@ -1765,6 +1766,13 @@ export default function ReviewSendPage({
             {sendResult &&
             <div className="review-flow-data-section">
                 <p className="muted small-note">i18n:govoplan-campaign.attempted.a9eb9c90 {String(sendResult.attempted_count ?? "—")}i18n:govoplan-campaign.smtp_accepted.a5d0dccc {String(sendResult.sent_count ?? "—")}i18n:govoplan-campaign.failed.fac9f871 {String(sendResult.failed_count ?? "—")}i18n:govoplan-campaign.outcome_unknown.4383023a {String(sendResult.outcome_unknown_count ?? 0)}i18n:govoplan-campaign.skipped.6b98496c {String(sendResult.skipped_count ?? "—")}.</p>
+                <p className="muted small-note">
+                  SMTP batch: {humanize(String(sendResult.batch_state ?? "not_started"))} · connections {String(sendResult.smtp_connection_count ?? 0)} · reconnects {String(sendResult.smtp_reconnect_count ?? 0)} · paused {String(sendResult.paused_count ?? 0)}.
+                </p>
+                {sendResult.batch_state === "paused" &&
+                  <DismissibleAlert tone="warning" resetKey={String(sendResult.batch_pause_reason_code ?? "smtp_systemic_failure")}>
+                    Remaining messages were paused before SMTP after a systemic transport failure ({String(sendResult.batch_pause_reason_code ?? "smtp_systemic_failure")}). Review the Mail profile, then resume the campaign queue.
+                  </DismissibleAlert>}
                 {sendResultRows.length > 0 &&
               <DataGrid
                 id={`campaign-${campaignId}-workflow-send-results`}