fix: 修复预览与 PDF 渲染边界问题

packages/renderer/src/render-markdown.ts

@@ -13,6 +13,15 @@ import sanitizeHtml from "sanitize-html";
 
 export const RENDERER_VERSION = 1;
 
+export class MarkdownDocumentParseError extends Error {
+  readonly code = "INVALID_FRONT_MATTER";
+
+  constructor(message: string, options?: ErrorOptions) {
+    super(message, options);
+    this.name = "MarkdownDocumentParseError";
+  }
+}
+
 export interface MarkdownDocumentMetadata {
   title: string;
   author: string;
@@ -198,9 +207,10 @@ function parseFrontMatter(source: string) {
     return matter(source);
   } catch (error) {
     const message = error instanceof Error ? error.message : "未知错误";
-    throw new Error(`无法解析 Markdown Front Matter：${message}`, {
-      cause: error
-    });
+    throw new MarkdownDocumentParseError(
+      `无法解析 Markdown Front Matter：${message}`,
+      { cause: error }
+    );
   }
 }