feat: add payment failed notifications to in-app notification center for owners and admins

CHANGELOG.md

@@ -11,6 +11,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 ### Added
 
 - **In-app notification center.** Bell icon in the header with dropdown of recent notifications. Uptime monitor status changes (down, degraded, recovered) create in-app notifications with links to the uptime page.
+- **Payment failed notifications.** When Stripe sends `invoice.payment_failed`, owners and admins receive an in-app notification with a link to update payment method. Members do not see billing notifications.
 
 ## [0.5.1-alpha] - 2026-02-12
 

components/notifications/NotificationCenter.tsx

@@ -46,7 +46,7 @@ function formatTimeAgo(dateStr: string): string {
 }
 
 function getTypeIcon(type: string) {
-  if (type.includes('down') || type.includes('degraded')) {
+  if (type.includes('down') || type.includes('degraded') || type.startsWith('billing_')) {
     return <AlertTriangleIcon className="w-4 h-4 shrink-0 text-amber-500" />
   }
   return <CheckCircleIcon className="w-4 h-4 shrink-0 text-emerald-500" />