feat: enhance TUI with colors, command hints, and improved rendering

src/frontends/tui/components/StatusBar.tsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { memo } from 'react';
 import { Box, Text } from 'ink';
 
 export interface StatusBarProps {
@@ -19,7 +19,7 @@ function formatTokens(n: number): string {
   return String(n);
 }
 
-export function StatusBar({
+export const StatusBar = memo(function StatusBar({
   sessionId,
   messageCount,
   model,
@@ -59,4 +59,4 @@ export function StatusBar({
       </Box>
     </Box>
   );
-}
+});