fix: 修复DOCX独立封面视觉门禁

统一 Chromium 与 DOCX 的受限高度封面布局，补齐可编辑边框、装饰边和 Office 页面舍入适配。

按四套独立封面主题、纵横方向及五组页边距执行 40 个 Word/WPS 真实视觉场景，严格失败为 0，并保留正文诊断供 D4 修复。

packages/docx-theme-engine/src/normalizer.ts

@@ -366,11 +366,12 @@ function normalizeComputedSlot(
         message: "CSS outline 已近似为 Word 四边边框"
       });
     } else {
+      style.outline = outline;
       diagnostic(context, {
-        severity: "warning",
-        code: "css-property-unsupported",
+        severity: "info",
+        code: "layout-approximated",
         property: "outline",
-        message: "CSS border 与 outline 并存，Word 单层边框仅保留 border，结构层需生成双层边框"
+        message: "CSS border 与 outline 并存，DOCX 容器将生成双层边框"
       });
     }
     context.approximate = true;
@@ -380,11 +381,18 @@ function normalizeComputedSlot(
       computed.outlineOffset
     );
     if (outlineOffsetPt !== undefined && outlineOffsetPt !== 0) {
+      if (style.outline) {
+        style.outlineOffsetPt = outlineOffsetPt;
+      }
       diagnostic(context, {
-        severity: "warning",
-        code: "css-property-unsupported",
+        severity: style.outline ? "info" : "warning",
+        code: style.outline
+          ? "layout-approximated"
+          : "css-property-unsupported",
         property: "outline-offset",
-        message: `Word 边框不支持 CSS outline-offset ${outlineOffsetPt}pt，结构层需近似处理`
+        message: style.outline
+          ? `DOCX 容器将以单元格间距近似 CSS outline-offset ${outlineOffsetPt}pt`
+          : `Word 边框不支持 CSS outline-offset ${outlineOffsetPt}pt，结构层需近似处理`
       });
       context.approximate = true;
     }

packages/docx-theme-engine/src/tokens.ts

@@ -105,6 +105,8 @@ export const docxSlotStyleTokenSchema = z.object({
       left: docxBorderTokenSchema.optional()
     })
     .optional(),
+  outline: docxBorderTokenSchema.optional(),
+  outlineOffsetPt: z.number().min(-1000).max(1000).optional(),
   widthPercent: z.number().min(0).max(100).optional(),
   minimumWidthPercent: z.number().min(0).max(100).optional(),
   minimumHeightPt: z.number().min(0).max(10000).optional(),