fix: resolve block list bug

api/src/chat/schemas/types/button.ts

@@ -22,7 +22,7 @@ const postBackButtonSchema = z.object({
 const webUrlButtonSchema = z.object({
   type: z.literal(ButtonType.web_url),
   title: z.string(),
-  url: z.string().url(),
+  url: z.union([z.string().url(), z.literal('')]),
   messenger_extensions: z.boolean().optional(),
   webview_height_ratio: z.enum(['compact', 'tall', 'full']).optional(),
 });

frontend/src/components/visual-editor/form/ListMessageForm.tsx

@@ -1,5 +1,5 @@
 /*
- * Copyright © 2024 Hexastack. All rights reserved.
+ * Copyright © 2025 Hexastack. All rights reserved.
  *
  * Licensed under the GNU Affero General Public License v3.0 (AGPLv3) with the following additional terms:
  * 1. The name "Hexabot" is a trademark of Hexastack. You may not use this name in derivative works without express written permission.
@@ -128,6 +128,7 @@ const ListMessageForm = () => {
                   (value && value >= 2 && value <= 4) ||
                   t("message.invalid_list_limit"),
               },
+              valueAsNumber: true,
             })}
             error={errors?.options?.["content"]?.["limit"]}
             helperText={errors?.options?.["content"]?.["limit"]?.message}