const viewport = document.querySelector('aparte-chat-viewport');
viewport.appendMessage({
id: 'preview',
role: 'assistant',
timestamp: Date.now(),
segments: [
{
id: 's1',
type: 'error',
content: 'The model did not answer.',
details: 'HTTP 429 — rate limited. Retrying in 20s.',
},
],
});