import { describe, it, expect } from 'vitest';import { normalizeAssistantMarkdownForRender } from './chat-markdown'; describe('normalizeAssistantMarkdownForRender', () => {  it('inserts newline after code fence language', () => {    const input = '```html<!DOCTYPE html>\n<body></body>\n```';    const out = normalizeAssistantMarkdownForRender(input);    expect(out).toMatch(/^```html\s*\r?\n/);    expect(out).toContain('<!DOCTYPE html>');  });   it('converts mermaidgraph to mermaid fenced block', () => {    const input = [      'mermaidgraph',      '  A --> B',      '``',      '',    ].join('\n');    const out = normalizeAssistantMarkdownForRender(input);    expect(out).toContain('```mermaid');    expect(out).toContain('A --> B');    expect(out).toContain('```');  });   it('repairs inline mermaidgraph fence headers', () => {    const input = '```mermaidgraph LR A-->B\n```';    const out = normalizeAssistantMarkdownForRender(input);    expect(out).toContain('```mermaid');    expect(out).toContain('graph LR');  });});