feat(tui): add ASCII art banner on startup

src/frontends/tui/components/MessageList.tsx

@@ -3,6 +3,7 @@ import { Box, Text, Static } from 'ink';
 import type { Message } from '../../../models/types.js';
 import { getMessageText } from '../../../models/media.js';
 import { renderMarkdown } from '../markdown.js';
+import { getBannerLines } from '../banner.js';
 
 export interface MessageListProps {
   messages: Message[];
@@ -80,7 +81,12 @@ export const MessageList = memo(function MessageList({
   return (
     <Box flexDirection="column" flexGrow={1} paddingX={1} overflowY="hidden">
       {visibleMessages.length === 0 && !streamingContent ? (
-        <Text color="gray">No messages yet. Start typing to chat with Flynn.</Text>
+        <Box flexDirection="column" alignItems="center" justifyContent="center" flexGrow={1}>
+          {getBannerLines().map((line, i) => (
+            <Text key={i} color="#ff8c00">{line}</Text>
+          ))}
+          <Text color="gray">{'\n'}Start typing to chat with Flynn.</Text>
+        </Box>
       ) : (
         <>
           <Static items={visibleMessages}>