feat(cli): truncate shell output in UI history and improve active shell display (#17438)

packages/cli/src/ui/components/messages/ToolResultDisplayOverflow.test.tsx

@@ -49,6 +49,7 @@ describe('ToolResultDisplay Overflow', () => {
           streamingState: StreamingState.Idle,
           constrainHeight: true,
         },
+        useAlternateBuffer: false,
       },
     );