feat: catch errors when sending messages #918 (#1113)

### What problem does this PR solve?

feat: catch errors when sending messages #918

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/flow/chat/box.tsx

@@ -82,6 +82,7 @@ const FlowChatBox = () => {
         onClose={hideModal}
         open={visible}
         width={'50vw'}
+        mask={false}
       >
         <DocumentPreviewer
           documentId={documentId}