release: 发布 v0.5.1

新增能力：内置 4 套红头、3 套正式文档和 3 套标书主题，支持主题推荐页边距、页面装饰、页眉页脚和页码；增加结构化公文、项目报告及标书 Front Matter，内置 Fandol 中文字体、两份教程和 14 份主题示例。

桌面工作流：重组更多菜单，增加新建、保存、另存为快捷键和未保存确认；另存为后跟随新路径，主题示例自动切换主题，Desktop 发行包完整携带教程、示例与字体。

问题修复：修正红头标题居中与正式文档字体；围栏代码按正文宽度自动换行，长内容安全断行，至少两行即可在当前页分页，并统一保留 8px 左侧内容留白；Docker Web 镜像正确打包 samples。

兼容与部署：未声明主题推荐设置时继续使用 16mm 默认页边距；Web 隐藏不适用的另存为。正式镜像 yixiong/md-to-pdf:v0.5.1 内容 ID 为 sha256:72f519a69bfd6cb2f6df30c2be938e58ceb6f20e4748a32551874de3d436b276，Compose 健康运行。

验证结果：最终修复前 65 个测试文件、286 项测试通过，最终代码块与主题定向测试 27 项通过；全项目类型检查、生产构建和 git diff --check 通过。容器检出 14 套主题、17 份 Markdown，代码块回归 PDF 为 2 页且无越界。NSIS SHA-256 为 676CCE73D782B0B15AC6BC68F253CFBC4740383583E4DAA98F746EDF9999C5CC，ZIP SHA-256 为 82BF6ADF1200604F145CC86FA3ED193955CF6741EBEE3DF8953483515CFF621F。

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

@@ -7,6 +7,7 @@ import {
   millimetersToCssPixels,
   millimetersToPdfPoints,
   paperDimensionsMm,
+  resolvePageMargins,
   supportedMermaidLayouts,
   supportedMermaidLooks,
   supportedMermaidThemes,
@@ -33,9 +34,11 @@ describe("导出配置", () => {
 
   it("使用 A4 和 16mm 作为默认纸张配置", () => {
     expect(defaultExportConfig.themeId).toBe("typora-github");
+    expect(defaultExportConfig.pageDecorationsMode).toBe("theme");
     expect(defaultExportConfig.paper).toEqual({
       format: "A4",
       orientation: "portrait",
+      marginMode: "theme",
       margins: {
         top: "16mm",
         right: "16mm",
@@ -46,6 +49,103 @@ describe("导出配置", () => {
     expect(exportConfigSchema.safeParse(defaultExportConfig).success).toBe(true);
   });
 
+  it("提供可由主题推荐的页眉和页码配置", () => {
+    expect(defaultExportConfig.header).toMatchObject({
+      fontFamily: '"Segoe UI", "Microsoft YaHei", sans-serif'
+    });
+    expect(defaultExportConfig.footer).toMatchObject({
+      fontFamily: '"Segoe UI", "Microsoft YaHei", sans-serif',
+      alignment: "center",
+      format: "page-total",
+      showOnFirstPage: true
+    });
+
+    const parsedLegacyV4 = exportConfigSchema.parse({
+      ...defaultExportConfig,
+      pageDecorationsMode: undefined,
+      header: {
+        ...defaultExportConfig.header,
+        fontFamily: undefined
+      },
+      footer: {
+        ...defaultExportConfig.footer,
+        fontFamily: undefined,
+        showOnFirstPage: undefined
+      }
+    });
+
+    expect(parsedLegacyV4.pageDecorationsMode).toBe("theme");
+    expect(parsedLegacyV4.header.fontFamily).toContain("Microsoft YaHei");
+    expect(parsedLegacyV4.footer.fontFamily).toContain("Microsoft YaHei");
+    expect(parsedLegacyV4.footer.showOnFirstPage).toBe(true);
+  });
+
+  it("支持公文页码格式和奇偶页外侧对齐", () => {
+    expect(
+      exportConfigSchema.safeParse({
+        ...defaultExportConfig,
+        footer: {
+          ...defaultExportConfig.footer,
+          fontFamily: '"Mdpdf Fandol Song", SimSun, serif',
+          fontSize: "4.94mm",
+          color: "#000000",
+          alignment: "outer",
+          format: "official-page",
+          showOnFirstPage: false
+        }
+      }).success
+    ).toBe(true);
+  });
+
+  it("拒绝可能逃逸 CSS 字体声明的页眉页码字体", () => {
+    expect(
+      exportConfigSchema.safeParse({
+        ...defaultExportConfig,
+        footer: {
+          ...defaultExportConfig.footer,
+          fontFamily: 'serif; color: red'
+        }
+      }).success
+    ).toBe(false);
+  });
+
+  it("按主题、自定义和全局默认顺序解析页边距", () => {
+    const themeMargins = {
+      top: "37mm",
+      right: "26mm",
+      bottom: "35mm",
+      left: "28mm"
+    };
+    expect(resolvePageMargins(defaultExportConfig.paper, themeMargins)).toEqual(
+      themeMargins
+    );
+    expect(resolvePageMargins(defaultExportConfig.paper)).toEqual({
+      top: "16mm",
+      right: "16mm",
+      bottom: "16mm",
+      left: "16mm"
+    });
+    expect(
+      resolvePageMargins(
+        {
+          marginMode: "custom",
+          margins: {
+            top: "10mm",
+            right: "11mm",
+            bottom: "12mm",
+            left: "13mm"
+          }
+        },
+        themeMargins
+      )
+    ).toEqual({
+      top: "10mm",
+      right: "11mm",
+      bottom: "12mm",
+      left: "13mm"
+    });
+  });
+
   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([

packages/core/tests/theme.test.ts

@@ -0,0 +1,60 @@
+import { describe, expect, it } from "vitest";
+import { themeManifestSchema } from "../src/theme.js";
+
+describe("主题清单", () => {
+  it("允许主题推荐页边距、页眉和页码配置", () => {
+    const parsed = themeManifestSchema.parse({
+      manifestVersion: 1,
+      id: "official-test",
+      name: "公文测试主题",
+      version: "0.5.1",
+      description: "测试主题推荐页面配置。",
+      author: "md-to-pdf contributors",
+      license: "项目自有",
+      entry: "theme.css",
+      domPreset: "generic",
+      defaultFontSize: "21.333px",
+      supportedFeatures: ["table"],
+      category: "red-letter",
+      compatibleProfiles: ["official"],
+      pageDefaults: {
+        margins: {
+          top: "37mm",
+          right: "26mm",
+          bottom: "35mm",
+          left: "28mm"
+        },
+        header: {
+          enabled: false,
+          height: "8mm",
+          showDivider: false,
+          fontSize: "4.94mm",
+          fontFamily: '"Mdpdf Fandol Song", SimSun, serif',
+          color: "#000000",
+          left: { enabled: false, content: "" },
+          center: { enabled: false, content: "" },
+          right: { enabled: false, content: "" }
+        },
+        footer: {
+          enabled: true,
+          height: "7mm",
+          showDivider: false,
+          fontSize: "4.94mm",
+          fontFamily: '"Mdpdf Fandol Song", SimSun, serif',
+          color: "#000000",
+          alignment: "outer",
+          format: "official-page",
+          startFrom: 1,
+          showOnFirstPage: false
+        }
+      },
+      bundled: true
+    });
+
+    expect(parsed.pageDefaults?.footer).toMatchObject({
+      alignment: "outer",
+      format: "official-page",
+      showOnFirstPage: false
+    });
+  });
+});