fix: 修复预览与 PDF 渲染边界问题

apps/server/tests/app.test.ts

@@ -110,6 +110,20 @@ describe("预览 API", () => {
     expect(response.json().error).toBe("INVALID_MARKDOWN");
   });
 
+  it("将无效 Front Matter 映射为文档请求错误", async () => {
+    app = buildApp({ logger: false });
+    const response = await app.inject({
+      method: "POST",
+      url: "/api/render",
+      payload: {
+        markdown: "---\ntitle: [未闭合\n---\n\n# 文档"
+      }
+    });
+
+    expect(response.statusCode).toBe(400);
+    expect(response.json().error).toBe("INVALID_FRONT_MATTER");
+  });
+
   it("返回内置主题 CSS", async () => {
     app = buildApp();
     const response = await app.inject({
@@ -237,6 +251,42 @@ describe("预览 API", () => {
     );
   });
 
+  it("忽略无效本地主题而不影响其他主题", async () => {
+    temporaryDirectory = await mkdtemp(join(tmpdir(), "md-to-pdf-theme-"));
+    const bundledRoot = join(temporaryDirectory, "bundled");
+    const localRoot = join(temporaryDirectory, "local");
+    const validThemeRoot = join(localRoot, "valid-theme");
+    const invalidThemeRoot = join(localRoot, "invalid-theme");
+    await mkdir(bundledRoot, { recursive: true });
+    await mkdir(validThemeRoot, { recursive: true });
+    await mkdir(invalidThemeRoot, { recursive: true });
+    await writeFile(
+      join(validThemeRoot, "theme.json"),
+      JSON.stringify(localThemeManifest("valid-theme")),
+      "utf8"
+    );
+    await writeFile(
+      join(validThemeRoot, "theme.css"),
+      "#write { color: #333; }",
+      "utf8"
+    );
+    const onWarning = vi.fn();
+    const registry = createThemeRegistry({
+      bundledRoot,
+      localRoot,
+      onWarning
+    });
+
+    await expect(registry.list()).resolves.toEqual([
+      expect.objectContaining({
+        manifest: expect.objectContaining({ id: "valid-theme" })
+      })
+    ]);
+    expect(onWarning).toHaveBeenCalledWith(
+      expect.stringContaining("invalid-theme")
+    );
+  });
+
   it("拒绝主题 CSS 导入外部地址", async () => {
     temporaryDirectory = await mkdtemp(join(tmpdir(), "md-to-pdf-theme-"));
     const bundledRoot = join(temporaryDirectory, "bundled");
@@ -357,6 +407,29 @@ describe("PDF API", () => {
     expect(response.json().error).toBe("INVALID_EXPORT_CONFIG");
   });
 
+  it("在 PDF 生成前拒绝无效 Front Matter", async () => {
+    const generate = vi.fn();
+    app = buildApp({
+      logger: false,
+      pdfGenerator: {
+        generate,
+        close: vi.fn(async () => undefined)
+      }
+    });
+    const response = await app.inject({
+      method: "POST",
+      url: "/api/pdf",
+      payload: {
+        markdown: "---\ntitle: [未闭合\n---\n",
+        exportConfig: defaultExportConfig
+      }
+    });
+
+    expect(response.statusCode).toBe(400);
+    expect(response.json().error).toBe("INVALID_FRONT_MATTER");
+    expect(generate).not.toHaveBeenCalled();
+  });
+
   it("映射 PDF 队列已满错误", async () => {
     app = buildApp({
       logger: false,