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/docx-engine/scripts/verify-theme-docx-matrix.mjs

@@ -11,6 +11,7 @@ import {
   PandocRuntime,
   resolveReferencePageOptions
 } from "@md-to-pdf/docx-engine";
+import { DOCX_STYLE_SLOT_NAMES } from "@md-to-pdf/docx-theme-engine";
 import { renderMarkdown } from "@md-to-pdf/renderer";
 import { unzipSync } from "fflate";
 
@@ -185,10 +186,17 @@ function inspectDocument(
       /<w:sectPr(?:\s[^>]*)?>[\s\S]*?<\/w:sectPr>/gu
     )
   ].map((match) => match[0]);
-  const fullWidthTableCount = countMatches(
-    documentXml,
-    /<w:tblW\s+w:w="5000"\s+w:type="pct"\s*\/>/gu
+  const tables = [
+    ...documentXml.matchAll(
+      /<w:tbl(?:\s|>)[\s\S]*?<\/w:tbl>/gu
+    )
+  ].map((match) => match[0]);
+  const contentTables = tables.filter((table) =>
+    /<w:tblStyle\s+w:val="Table"\s*\/>/u.test(table)
   );
+  const fullWidthTableCount = contentTables.filter((table) =>
+    /<w:tblW\s+w:w="5000"\s+w:type="pct"\s*\/>/u.test(table)
+  ).length;
   const internalMarkerCount = countMatches(
     documentXml,
     /MD_TO_PDF_(?:CONTAINER|SECTION)_/gu
@@ -216,7 +224,9 @@ function inspectDocument(
     bytes: content.byteLength,
     page: pageOptions,
     paragraphCount: countMatches(documentXml, /<w:p(?:\s|>)/gu),
-    tableCount: countMatches(documentXml, /<w:tbl(?:\s|>)/gu),
+    tableCount: tables.length,
+    contentTableCount: contentTables.length,
+    structuralTableCount: tables.length - contentTables.length,
     drawingCount: countMatches(documentXml, /<w:drawing(?:\s|>)/gu),
     explicitPageBreaks,
     sectionCount: sections.length,
@@ -280,6 +290,7 @@ function createMediaResource(kind, ordinal, kindOrdinal) {
     ...(kind === "image"
       ? {}
       : { caption: `${kind} 主题验收图 ${kindOrdinal}` }),
+    alignment: "center",
     displayWidthPx: dimensions.width,
     displayHeightPx: dimensions.height,
     captureX: 0,
@@ -345,8 +356,8 @@ function readThemeTokenReport(themes) {
   const tokensByTheme = new Map(
     report.tokenSets.map((tokens) => {
       assert(
-        tokens.slots?.length === 56,
-        `主题 ${tokens.themeId} 的真实令牌槽位不是 56`
+        tokens.slots?.length === DOCX_STYLE_SLOT_NAMES.length,
+        `主题 ${tokens.themeId} 的真实令牌槽位不是 ${DOCX_STYLE_SLOT_NAMES.length}`
       );
       assert(
         /^[a-f0-9]{64}$/u.test(tokens.themeFingerprint ?? ""),
@@ -483,7 +494,7 @@ for (const result of results) {
     `主题 ${result.id} 存在重复标题`
   );
   assert(
-    inspection.fullWidthTableCount === inspection.tableCount,
+    inspection.fullWidthTableCount === inspection.contentTableCount,
     `主题 ${result.id} 存在非内容区全宽表格`
   );
   if (inspection.profile) {