feat(signing): 前端生成签署后 PDF 原型

clinical-web/src/views/workbench/signing/components/SigningTaskDetail.vue

@@ -1,4 +1,6 @@
 <script setup lang="ts">
+import { ref } from 'vue'
+
 import type {
   SigningAnswers,
   SigningArtifact,
@@ -33,6 +35,15 @@ const emit = defineEmits<{
   selectionChange: [items: string[]]
   fieldChange: [answers: SigningAnswers, progress: SigningFieldProgress]
 }>()
+
+const documentRef = ref<InstanceType<typeof SigningDocumentInteractive> | null>(null)
+
+/** 供父级「导出 PDF」使用：转发到实际渲染文书的那一层 */
+function getDocumentElement() {
+  return documentRef.value?.getDocumentElement() ?? null
+}
+
+defineExpose({ getDocumentElement })
 </script>
 
 <template>
@@ -150,6 +161,7 @@ const emit = defineEmits<{
       <!-- 任务创建时固化了文书 HTML 的走交互化渲染；老任务回退到静态纸样预览 -->
       <SigningDocumentInteractive
         v-if="task.documentContentHtml"
+        ref="documentRef"
         :task="task"
         :interactive="allowLocalSigning && task.status !== 'signed' && task.status !== 'void'"
         @selection-change="emit('selectionChange', $event)"