feat: poll checkout status and show failures

resources/js/admin/i18n/locales/en/management.json

@@ -36,11 +36,21 @@
     },
     "checkoutSuccess": "Checkout completed. Your package will activate shortly.",
     "checkoutCancelled": "Checkout was cancelled.",
+    "checkoutActivated": "Your package is now active.",
     "checkoutPendingTitle": "Activating your package",
     "checkoutPendingBody": "This can take a few minutes. We will update this screen once the package is active.",
     "checkoutPendingBadge": "Pending",
     "checkoutPendingRefresh": "Refresh",
     "checkoutPendingDismiss": "Dismiss",
+    "checkoutFailedTitle": "Checkout failed",
+    "checkoutFailedBody": "The payment did not complete. You can try again or contact support.",
+    "checkoutFailedBadge": "Failed",
+    "checkoutFailedRetry": "Try again",
+    "checkoutFailedDismiss": "Dismiss",
+    "checkoutFailureReasons": {
+      "paddle_failed": "The payment was declined.",
+      "paddle_cancelled": "The checkout was cancelled."
+    },
     "sections": {
       "invoices": {
         "title": "Invoices & payments",