fix(web): render system messages without MessagePrimitive.Root

https://github.com/assistant-ui/assistant-ui/issues/2954

web/src/components/AssistantChat/messages/SystemMessage.tsx

@@ -1,4 +1,4 @@
-import { MessagePrimitive, useAssistantState } from '@assistant-ui/react'
+import { useAssistantState } from '@assistant-ui/react'
 import { getEventPresentation } from '@/chat/presentation'
 import type { HappyChatMessageMetadata } from '@/lib/assistant-runtime'
 
@@ -12,13 +12,13 @@ export function HappySystemMessage() {
     const icon = event ? getEventPresentation(event).icon : null
 
     return (
-        <MessagePrimitive.Root className="py-1">
+        <div className="py-1">
             <div className="mx-auto w-fit max-w-[92%] px-2 text-center text-xs text-[var(--app-hint)] opacity-80">
                 <span className="inline-flex items-center gap-1">
                     {icon ? <span aria-hidden="true">{icon}</span> : null}
                     <span>{text}</span>
                 </span>
             </div>
-        </MessagePrimitive.Root>
+        </div>
     )
 }