feat: 完善导出设置与打印预览

packages/renderer/tests/render-markdown.test.ts

@@ -33,6 +33,21 @@ const answer = 42;
     );
   });
 
+  it("保留 Markdown 表格的列对齐语义", () => {
+    const result = renderMarkdown(`
+| 左对齐 | 居中 | 右对齐 |
+| :--- | :---: | ---: |
+| A | B | C |
+`);
+
+    expect(result.bodyHtml).toContain('<th style="text-align:left">左对齐</th>');
+    expect(result.bodyHtml).toContain('<th style="text-align:center">居中</th>');
+    expect(result.bodyHtml).toContain('<th style="text-align:right">右对齐</th>');
+    expect(result.bodyHtml).toContain('<td style="text-align:left">A</td>');
+    expect(result.bodyHtml).toContain('<td style="text-align:center">B</td>');
+    expect(result.bodyHtml).toContain('<td style="text-align:right">C</td>');
+  });
+
   it("读取并规范化 Front Matter 元数据", () => {
     const result = renderMarkdown(`---
 title: 项目报告
@@ -74,6 +89,29 @@ flowchart LR
     );
   });
 
+  it("完整保留 Mermaid 区块内的 config frontmatter", () => {
+    const result = renderMarkdown(`
+\`\`\`mermaid
+---
+title: Frontmatter 示例
+config:
+  theme: forest
+  look: handDrawn
+  flowchart:
+    curve: basis
+---
+flowchart LR
+  A[开始] --> B[结束]
+\`\`\`
+`);
+
+    expect(result.bodyHtml).toContain("title: Frontmatter 示例");
+    expect(result.bodyHtml).toContain("theme: forest");
+    expect(result.bodyHtml).toContain("look: handDrawn");
+    expect(result.bodyHtml).toContain("curve: basis");
+    expect(result.bodyHtml).toContain("flowchart LR");
+  });
+
   it("阻止原始 HTML 和危险链接形成可执行内容", () => {
     const result = renderMarkdown(`
 <script>alert("xss")</script>