fix(knowledge): use native file downloads in app

mobile-uni/src/pages/user/sop/index.vue

@@ -442,7 +442,7 @@ import { resetPageScroll } from '@/services/navigation';
 import { ApiError, authenticatedFileUrl, releaseAuthenticatedFileUrl } from '@/services/api';
 import { ensureEmployeePosition, fetchMobileIdentity } from '@/services/position';
 import { chooseSpeechAudio, createSpeechPlaybackController, measureAudioDuration, MENTOR_VOICE_PROFILE, transcribeSpeechCapture, transcribeSpeechFile } from '@/services/speech';
-import type { SpeechCapture } from '@/services/speech-capture';
+import { isNativeAppRuntime, type SpeechCapture } from '@/services/speech-capture';
 import { downloadSummaryCardImage } from '@/services/summary-card-image';
 import { getMemoryCandidates } from '@/services/personal-assistant';
 import { currentAccountKey } from '@/services/request-scope';
@@ -1209,10 +1209,10 @@ const openKnowledgeResource = async (resource: KnowledgeResource) => {
   try {
     if (resource.type === 'FILE') {
       const downloadUrl = await requestKnowledgeResourceDownloadLink(resource.attachmentId);
-      if (typeof document !== 'undefined') {
+      if (!isNativeAppRuntime() && typeof document !== 'undefined') {
         const link = document.createElement('a');
         link.href = downloadUrl;
-        link.target = '_blank';
+        link.download = resource.title || '资料文件';
         link.rel = 'noreferrer';
         document.body.appendChild(link);
         link.click();