完善客户端模块与工作区能力

tests/unit/light-visual-system.test.ts

@@ -54,6 +54,14 @@ describe('light visual system', () => {
     expect(uiSource).not.toMatch(/#3A5578|#F2F5F8|#4b6385|bg-sky-500/i);
   });
 
+  it('does not reserve synthetic height for chat transcript message wrappers', () => {
+    const globalsSource = readSource('styles/globals.css');
+    const transcriptRule = globalsSource.match(/\.chat-transcript-message\s*\{[^}]*\}/)?.[0] ?? '';
+
+    expect(transcriptRule).not.toContain('content-visibility');
+    expect(transcriptRule).not.toContain('contain-intrinsic-size');
+  });
+
   it('uses bundled mixed-script typography with language-aware fallbacks', () => {
     const globalsSource = readSource('styles/globals.css');
     const tailwindSource = readFileSync(join(process.cwd(), 'tailwind.config.js'), 'utf8');