Fix filtering to use both client type and instanceId for unique identification

public/app.js

@@ -386,9 +386,11 @@ function renderDownloads() {
   // Filter downloads by selected clients
   let filteredDownloads = downloads;
   if (selectedDownloadClients.length > 0) {
-    // Map indices to instanceIds
-    const selectedInstanceIds = selectedDownloadClients.map(idx => downloadClients[idx]?.id).filter(Boolean);
-    filteredDownloads = downloads.filter(d => selectedInstanceIds.includes(d.instanceId));
+    // Map indices to client objects, then filter by both client type and instanceId
+    const selectedClients = selectedDownloadClients.map(idx => downloadClients[idx]).filter(Boolean);
+    filteredDownloads = downloads.filter(d =>
+      selectedClients.some(c => c.type === d.client && c.id === d.instanceId)
+    );
   }
 
   // Sort downloads by client order (matching the order in downloadClients)