fix: 用 data URL 下载，和原插件方式一致

web-to-ppt/popup.js

@@ -104,23 +104,22 @@ async function exportPptx() {
     // 4. 生成 PPTX
     setProgress(90, '正在打包...');
     const blob = await WebToPPT.schemaToPptxBlob(schema);
-    console.log('[WebToPPT] blob size:', blob.size, 'type:', blob.type);
 
-    // 5. 下载
+    // 5. 下载（用 data URL，和原插件一致）
     setProgress(95, '正在下载...');
-    const url = URL.createObjectURL(blob);
+    const buffer = await blob.arrayBuffer();
+    const bytes = new Uint8Array(buffer);
+    let binary = '';
+    for (let i = 0; i < bytes.length; i += 0x8000) {
+      binary += String.fromCharCode(...bytes.subarray(i, i + 0x8000));
+    }
+    const dataUrl = 'data:application/vnd.openxmlformats-officedocument.presentationml.presentation;base64,' + btoa(binary);
+
     const title = jsonData.source?.title || 'webpage';
     const safeTitle = title.replace(/[\\/:*?"<>|]+/g, '-').replace(/\s+/g, '-').slice(0, 64) || 'webpage';
     const filename = `web-to-ppt/${safeTitle}-${Date.now()}.pptx`;
 
-    try {
-      const dlId = await chrome.downloads.download({ url, filename });
-      console.log('[WebToPPT] download started, id:', dlId);
-    } catch (dlErr) {
-      console.error('[WebToPPT] download failed:', dlErr);
-      throw dlErr;
-    }
-    setTimeout(() => URL.revokeObjectURL(url), 60000);
+    await chrome.downloads.download({ url: dataUrl, filename });
 
     setProgress(100, `已导出：${filename}`);
     setResult('success', '导出完成');