fix(mail): include guest list in RSVP emails

server/internal/api/handlers.go

@@ -105,7 +105,11 @@ func (s *Server) handleRSVP(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if err := s.mailer.SendRSVP(rsvp); err != nil {
+	allGuests, err := s.store.ListGuests()
+	if err != nil {
+		log.Printf("rsvp: list guests failed: %v", err)
+	}
+	if err := s.mailer.SendRSVP(rsvp, allGuests); err != nil {
 		log.Printf("rsvp: email failed: %v", err)
 	}
 	if err := s.webhook.SendRSVP(rsvp); err != nil {