Fix gather extract: poll task status before download

index.html.final

@@ -2594,7 +2594,23 @@ async function doExtract() {
       return;
     }
     
-    var blob = await r.blob();
+    var taskData = await r.json();
+    if (!taskData.task_id) {
+      setInfo('Extract error: no task_id returned');
+      return;
+    }
+    var taskId = taskData.task_id;
+    setInfo('📥 Processing extract task...');
+    
+    // Poll until done
+    while (true) {
+      await new Promise(function(resolve) { setTimeout(resolve, 2000); });
+      var sr = await fetch(API + '/tasks/' + taskId);
+      var sd = await sr.json();
+      if (sd.status === 'done') {
+        setInfo('📥 Downloading ZIP...');
+        var dr = await fetch(API + '/tasks/' + taskId + '/download');
+        var blob = await dr.blob();
         var url = URL.createObjectURL(blob);
         var a = document.createElement('a');
         a.href = url;
@@ -2603,8 +2619,15 @@ async function doExtract() {
         a.click();
         document.body.removeChild(a);
         URL.revokeObjectURL(url);
-    
         setInfo('📥 Downloaded: ' + (blob.size / 1e6).toFixed(1) + ' MB');
+        break;
+      } else if (sd.status === 'error') {
+        setInfo('Extract error: ' + (sd.error || 'unknown'));
+        break;
+      } else {
+        setInfo('📥 Processing... ' + (sd.progress || ''));
+      }
+    }
   } catch(e) {
     setInfo('Extract error: ' + e.message);
   }