Introduce initial screen reader mode handling and flag (#6653)

packages/cli/src/ui/components/messages/UserMessage.tsx

@@ -7,6 +7,7 @@
 import React from 'react';
 import { Text, Box } from 'ink';
 import { Colors } from '../../colors.js';
+import { SCREEN_READER_USER_PREFIX } from '../../constants.js';
 
 interface UserMessageProps {
   text: string;
@@ -31,7 +32,9 @@ export const UserMessage: React.FC<UserMessageProps> = ({ text }) => {
       alignSelf="flex-start"
     >
       <Box width={prefixWidth}>
-        <Text color={textColor}>{prefix}</Text>
+        <Text color={textColor} aria-label={SCREEN_READER_USER_PREFIX}>
+          {prefix}
+        </Text>
       </Box>
       <Box flexGrow={1}>
         <Text wrap="wrap" color={textColor}>