style: auto-fix ESLint issues (curly braces and formatting)

- Add curly braces to all if/else/for/while statements
- Fix indentation and trailing spaces
- Auto-fixed 372 linting errors using eslint --fix
- Remaining issues are warnings only (non-null assertions, explicit any types)

src/frontends/tui/components/MessageList.tsx

@@ -19,26 +19,26 @@ function formatTimestamp(timestamp: number): string {
   const minutes = Math.floor(seconds / 60);
   const hours = Math.floor(minutes / 60);
   const days = Math.floor(hours / 24);
-  
-  if (seconds < 60) return 'just now';
-  if (minutes < 60) return `${minutes}m ago`;
-  if (hours < 24) return `${hours}h ago`;
-  if (days < 7) return `${days}d ago`;
+
+  if (seconds < 60) {return 'just now';}
+  if (minutes < 60) {return `${minutes}m ago`;}
+  if (hours < 24) {return `${hours}h ago`;}
+  if (days < 7) {return `${days}d ago`;}
   return new Date(timestamp).toLocaleDateString([], { month: 'short', day: 'numeric' });
 }
 
 // Individual message component
-const MessageItem = memo(function MessageItem({ 
-  message, 
-  index 
-}: { 
-  message: Message; 
+const MessageItem = memo(function MessageItem({
+  message,
+  index,
+}: {
+  message: Message;
   index: number;
 }): React.ReactElement {
   const isUser = message.role === 'user';
   const accentColor = isUser ? 'blue' : '#ff8c00';
   const timestampText = message.timestamp ? formatTimestamp(message.timestamp) : '';
-  
+
   return (
     <Box
       key={index}
@@ -59,7 +59,7 @@ const MessageItem = memo(function MessageItem({
           </Text>
           <Text color="gray">| {timestampText}</Text>
         </Box>
-        
+
         {/* Content */}
         <Text wrap="wrap">
           {message.role === 'assistant'