fix: system messages show actor name instead of 'Система (Name)'

src/components/ChatPanel.tsx

@@ -306,7 +306,7 @@ export default function ChatPanel({ chatId, projectId }: Props) {
           <span>{AUTHOR_ICON[msg.author_type] || "👤"}</span>
           <span className="font-medium">
             {msg.author_type === "system"
-              ? (msg.actor ? `Система (${msg.actor.name})` : "Система")
+              ? (msg.actor?.name || "Система")
               : (msg.author?.name || msg.author?.slug || "Unknown")}
           </span>
           <span>·</span>