feat(webhooks): admin replay for failed/dead-letter deliveries

Outbound webhook deliveries already retry with backoff, dead-letter
after maxAttempts, and notify super admins. This adds operator-level
replay: a per-row button on the deliveries log spawns a fresh pending
delivery + queues a new BullMQ job. The original failed row stays
intact so the response body remains for audit; the replay payload
carries retried_from/retried_at markers so receivers can deduplicate.

Inbound idempotency was already handled via the documentEvents
signatureHash unique index.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/admin/webhooks/webhook-delivery-log.tsx

@@ -1,6 +1,8 @@
 'use client';
 
 import { useEffect, useState } from 'react';
+import { RotateCcw } from 'lucide-react';
+import { toast } from 'sonner';
 import { Badge } from '@/components/ui/badge';
 import { Button } from '@/components/ui/button';
 import {
@@ -39,6 +41,22 @@ export function WebhookDeliveryLog({ webhookId }: Props) {
   const [total, setTotal] = useState(0);
   const [page, setPage] = useState(1);
   const [loading, setLoading] = useState(true);
+  const [retrying, setRetrying] = useState<string | null>(null);
+
+  async function retry(deliveryId: string) {
+    setRetrying(deliveryId);
+    try {
+      await apiFetch(`/api/v1/admin/webhooks/${webhookId}/deliveries/${deliveryId}/redeliver`, {
+        method: 'POST',
+      });
+      toast.success('Replay queued');
+      await load(page);
+    } catch (err) {
+      toast.error(err instanceof Error ? err.message : 'Replay failed');
+    } finally {
+      setRetrying(null);
+    }
+  }
 
   async function load(p: number) {
     setLoading(true);
@@ -80,6 +98,7 @@ export function WebhookDeliveryLog({ webhookId }: Props) {
             <TableHead>HTTP</TableHead>
             <TableHead>Attempt</TableHead>
             <TableHead>Time</TableHead>
+            <TableHead className="w-16 text-right">Replay</TableHead>
           </TableRow>
         </TableHeader>
         <TableBody>
@@ -96,6 +115,22 @@ export function WebhookDeliveryLog({ webhookId }: Props) {
                   ? new Date(d.deliveredAt).toLocaleString()
                   : new Date(d.createdAt).toLocaleString()}
               </TableCell>
+              <TableCell className="text-right">
+                {(d.status === 'failed' || d.status === 'dead_letter') && (
+                  <Button
+                    variant="ghost"
+                    size="sm"
+                    disabled={retrying === d.id}
+                    onClick={() => retry(d.id)}
+                    title="Replay this delivery"
+                    aria-label="Replay this delivery"
+                  >
+                    <RotateCcw
+                      className={`h-3.5 w-3.5 ${retrying === d.id ? 'animate-spin' : ''}`}
+                    />
+                  </Button>
+                )}
+              </TableCell>
             </TableRow>
           ))}
         </TableBody>