refactor: 收敛渲染链路共享抽象

apps/web/src/paged-preview.ts

@@ -1,27 +1,15 @@
 import {
   getPaperDimensionsMm,
-  type ExportConfig
+  type ExportConfig,
+  type MarkdownDocumentMetadata,
+  type PagedDocumentPayload
 } from "@md-to-pdf/core";
 import { PREVIEW_SCROLLBAR_WIDTH_PX } from "./preview-page";
 
 export const PAGED_PREVIEW_MESSAGE_SCOPE = "md-to-pdf:paged-preview";
 
-export interface PreviewMetadata {
-  title: string;
-  author: string;
-  subject: string;
-  keywords: string[];
-  language: string;
-}
-
-export interface PagedPreviewPayload {
-  articleHtml: string;
-  fileName: string;
-  metadata: PreviewMetadata;
-  features: string[];
-  themeCss: string;
-  exportConfig: ExportConfig;
-}
+export type PreviewMetadata = MarkdownDocumentMetadata;
+export type PagedPreviewPayload = PagedDocumentPayload;
 
 export interface PagedPreviewRenderRequest {
   scope: typeof PAGED_PREVIEW_MESSAGE_SCOPE;
@@ -45,7 +33,6 @@ export type PagedPreviewFrameMessage =
       type: "rendered";
       requestId: number;
       pageCount: number;
-      contentHeight: number;
       mermaidErrors: string[];
     }
   | {