feat(aihr): close functional checklist gaps

mobile-uni/tests/broadcast-attachment.test.mjs

@@ -4,16 +4,22 @@ import test from 'node:test';
 
 const read = (path) => readFile(new URL(path, import.meta.url), 'utf8');
 
-test('公司文件在员工端展示摘要、受控原文件入口并继续复用消息ID追问', async () => {
+test('公司文件在员工端优先在线阅读、按授权下载并继续复用消息ID追问', async () => {
   const [service, detail] = await Promise.all([
     read('../src/services/broadcast.ts'),
     read('../src/pages/user/broadcast/detail.vue')
   ]);
 
   assert.match(service, /interface BroadcastAttachment/);
-  assert.match(service, /downloadUrl: string/);
+  assert.match(service, /viewUrl: string/);
+  assert.match(service, /downloadUrl\?: string/);
+  assert.match(service, /allowDownload: boolean/);
+  assert.match(service, /getBroadcastAttachmentView/);
   assert.match(detail, /公司文件/);
   assert.match(detail, /attachment\.summary/);
   assert.match(detail, /authenticatedFileUrl/);
+  assert.match(detail, /item.attachment.allowDownload && item.attachment.downloadUrl/);
+  assert.match(detail, /在线阅读/);
+  assert.match(detail, /watermark-layer/);
   assert.match(detail, /saveBroadcastQuestionContext\(item\.value\.id/);
 });