Fix missing default cases in PreviewModal switch statements

Added default cases to getStatusColor() and getStatusIcon() functions
to prevent undefined returns. The functions now return sensible
fallback values ('text-gray-500' and '?' respectively) if an
unexpected status value is encountered.

This improves code robustness and prevents potential runtime errors.

src/components/PreviewModal.tsx

@@ -36,6 +36,8 @@ export function PreviewModal({ open, onClose, code }: PreviewModalProps) {
         return 'text-yellow-500';
       case 'conflict':
         return 'text-red-500';
+      default:
+        return 'text-gray-500';
     }
   };
 
@@ -47,6 +49,8 @@ export function PreviewModal({ open, onClose, code }: PreviewModalProps) {
         return '⚠';
       case 'conflict':
         return '✗';
+      default:
+        return '?';
     }
   };