feat: 完成 DOCX R4 元素级视觉门禁

建立 Chromium、Word 与 WPS 的可编辑内容、段落几何、页眉页脚、封面、媒体和逐页视觉比较链路。

支持封面独立分节、正文页码重启、主题页边距与横向纸张，并将自然分页差异降为诊断项。

修正代码块内边距和折叠表格单元格边框映射，14 套主题生产矩阵与六组布局视觉矩阵通过。

packages/core/src/document.ts

@@ -26,6 +26,7 @@ export interface PagedDocumentPayload {
   articleHtml: string;
   fileName: string;
   metadata: MarkdownDocumentMetadata;
+  semanticDocument: SemanticDocumentModel;
   features: ThemeFeature[];
   themeCss: string;
   exportConfig: ExportConfig;
@@ -48,6 +49,7 @@ export function createPagedDocumentPayload({
     articleHtml: document.articleHtml,
     fileName,
     metadata: document.metadata,
+    semanticDocument: document.semanticDocument,
     features: document.features,
     themeCss,
     exportConfig

packages/core/src/docx.ts

@@ -96,6 +96,16 @@ export const docxMediaKindSchema = z.enum([
 
 export type DocxMediaKind = z.infer<typeof docxMediaKindSchema>;
 
+export const docxMediaAlignmentSchema = z.enum([
+  "left",
+  "center",
+  "right"
+]);
+
+export type DocxMediaAlignment = z.infer<
+  typeof docxMediaAlignmentSchema
+>;
+
 export const docxMediaCaptureTargetSchema = z.object({
   id: z.string().regex(/^docx-media-\d+$/u),
   kind: docxMediaKindSchema,
@@ -107,6 +117,7 @@ export const docxMediaCaptureTargetSchema = z.object({
     .max(MAXIMUM_DOCX_RESOURCE_COUNT),
   altText: z.string().max(1_000),
   caption: z.string().max(1_000).optional(),
+  alignment: docxMediaAlignmentSchema,
   displayWidthPx: z.number().positive().max(10_000),
   displayHeightPx: z.number().positive().max(10_000),
   captureX: z.number().int().nonnegative().max(100_000),

packages/core/src/export-config.ts

@@ -51,8 +51,8 @@ export const paperDimensionsMm: Record<
   A3: { width: 297, height: 420 },
   A4: { width: 210, height: 297 },
   A5: { width: 148, height: 210 },
-  Letter: { width: 216, height: 279 },
-  Legal: { width: 216, height: 356 }
+  Letter: { width: 215.9, height: 279.4 },
+  Legal: { width: 215.9, height: 355.6 }
 };
 
 const lengthSchema = z
@@ -114,6 +114,7 @@ const pageDecorationFontFamilySchema = z
 export const headerSchema = z.object({
   enabled: z.boolean(),
   height: lengthSchema,
+  showOnFirstPage: z.boolean().default(true),
   showDivider: z.boolean(),
   fontSize: lengthSchema,
   fontFamily: pageDecorationFontFamilySchema.default(
@@ -289,6 +290,7 @@ export const defaultExportConfig: ExportConfig = {
   header: {
     enabled: false,
     height: "8mm",
+    showOnFirstPage: true,
     showDivider: false,
     fontSize: "3mm",
     fontFamily: '"Segoe UI", "Microsoft YaHei", sans-serif',

packages/core/src/semantic-document.ts

@@ -60,6 +60,7 @@ export interface SemanticDocumentTextNode {
 export interface SemanticDocumentGroupNode {
   kind: "group";
   role: SemanticDocumentRole;
+  layout?: "space-between" | undefined;
   children: SemanticDocumentNode[];
 }
 
@@ -80,6 +81,7 @@ export const semanticDocumentNodeSchema: z.ZodType<
     z.object({
       kind: z.literal("group"),
       role: semanticDocumentRoleSchema,
+      layout: z.literal("space-between").optional(),
       children: z.array(semanticDocumentNodeSchema).min(1).max(30)
     })
   ])