Drop the word image from the chat attachment alt.

CI=true makes the beta production build fail on jsx-a11y/img-redundant-alt.

Closes #132.

llm-fe/src/llm-fe/components/ConversationDetailCard/ConversationDetailCard.tsx

@@ -321,7 +321,7 @@ const ConversationDetailCard = ({
         {imageSrc && (
           <img
             src={imageSrc}
-            alt="Attached image"
+            alt="Attachment"
             style={{
               display: 'block',
               maxWidth: '100%',