feat: 完善 Mermaid 配置与预览缩放

packages/core/tests/export-config.test.ts

@@ -7,6 +7,9 @@ import {
   millimetersToCssPixels,
   millimetersToPdfPoints,
   paperDimensionsMm,
+  supportedMermaidLayouts,
+  supportedMermaidLooks,
+  supportedMermaidThemes,
   supportedPaperFormats
 } from "../src/export-config.js";
 
@@ -42,6 +45,43 @@ describe("导出配置", () => {
     expect(exportConfigSchema.safeParse(defaultExportConfig).success).toBe(true);
   });
 
+  it("提供 Mermaid 官方布局、主题、外观和字体默认值", () => {
+    expect(supportedMermaidLayouts).toEqual(["dagre", "elk"]);
+    expect(supportedMermaidLooks).toEqual([
+      "classic",
+      "handDrawn",
+      "neo"
+    ]);
+    expect(supportedMermaidThemes).toContain("redux-dark-color");
+    expect(defaultExportConfig.mermaid).toEqual({
+      layout: "dagre",
+      theme: "default",
+      look: "classic",
+      fontFamily: "Segoe UI, Microsoft YaHei, sans-serif"
+    });
+  });
+
+  it("拒绝 Mermaid 未支持的导出配置", () => {
+    expect(
+      exportConfigSchema.safeParse({
+        ...defaultExportConfig,
+        mermaid: {
+          ...defaultExportConfig.mermaid,
+          layout: "unknown"
+        }
+      }).success
+    ).toBe(false);
+    expect(
+      exportConfigSchema.safeParse({
+        ...defaultExportConfig,
+        mermaid: {
+          ...defaultExportConfig.mermaid,
+          fontFamily: ""
+        }
+      }).success
+    ).toBe(false);
+  });
+
   it("使用统一的 96 CSS px/in 和 72 PDF pt/in 换算物理尺寸", () => {
     expect(millimetersToCssPixels(25.4)).toBeCloseTo(96);
     expect(cssPixelsToMillimeters(96)).toBeCloseTo(25.4);