feat(webhooks): display webhook statistics (events received, polls skipped, last event) in status panel

client/src/App.css

@@ -459,3 +459,41 @@ body {
 .trigger-value.inactive {
   color: #999;
 }
+
+.webhook-stats {
+  margin-top: 15px;
+  padding-top: 15px;
+  border-top: 1px solid #e0e0e0;
+}
+
+.webhook-stats-title {
+  color: #999;
+  font-size: 0.75rem;
+  font-weight: 600;
+  text-transform: uppercase;
+  letter-spacing: 0.6px;
+  margin-bottom: 10px;
+}
+
+.webhook-stats-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
+  gap: 10px;
+}
+
+.webhook-stat {
+  display: flex;
+  flex-direction: column;
+  gap: 3px;
+}
+
+.webhook-stat-label {
+  color: #999;
+  font-size: 0.8rem;
+}
+
+.webhook-stat-value {
+  color: #333;
+  font-size: 0.95rem;
+  font-weight: 500;
+}