fix(web): show warning if upload completed with errors (#3634)

web/src/lib/stores/upload.ts

@@ -4,6 +4,7 @@ import type { UploadAsset } from '../models/upload-asset';
 function createUploadStore() {
   const uploadAssets = writable<Array<UploadAsset>>([]);
   const duplicateCounter = writable(0);
+  const errorCounter = writable(0);
 
   const { subscribe } = uploadAssets;
 
@@ -36,6 +37,7 @@ function createUploadStore() {
 
   return {
     subscribe,
+    errorCounter,
     duplicateCounter,
     isUploading,
     addNewUploadAsset,