Surface platform SMTP errors on speaker invitation failures.

Return the Bird API error instead of a generic wallet message so domain and balance issues are actionable.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Services/Events/EventEmailService.php

@@ -9,6 +9,11 @@ class EventEmailService
 {
     public function __construct(private readonly PlatformEmailClient $platform) {}
 
+    public function lastError(): ?string
+    {
+        return $this->platform->lastError();
+    }
+
     public function sendProgrammeShare(
         string $ownerPublicId,
         string $to,