fix(conversation): update dependency on conversation ID for effect hooks

web/app/dashboard/conversations/_components/chat-panel.tsx

@@ -173,7 +173,7 @@ export function ChatPanel() {
       toast.error(error instanceof Error ? error.message : "设置已读失败");
     });
   }, [
-    conversation,
+    conversation?.id,
     getViewport,
     isNearBottom,
     loading,

web/components/kefu/chat-shell.tsx

@@ -137,7 +137,7 @@ export function KefuChatShell() {
     void markConversationRead().catch((readError) => {
       console.error("Failed to mark kefu conversation read", readError)
     })
-  }, [conversation, isVisible, markConversationRead])
+  }, [conversation?.id, isVisible, markConversationRead])
 
   useEffect(() => {
     return bindKefuHostBridge({