AI Implementation feature(903): Admin Area Challenges: List, Import/Export and Add/Edit Modal 1.03 (#44)

frontend/src/app/features/admin/challenges/challenges.component.ts

@@ -25,6 +25,7 @@ import {
   categoryIconSrc,
   deriveEmptyState,
   difficultyClass,
+  importErrorMessage,
   summarizeImportPreview,
   summarizeImportResult,
 } from './challenges.pure';
@@ -459,11 +460,11 @@ export class AdminChallengesComponent implements OnInit, OnDestroy {
     this.importError.set(null);
     try {
       const result = await this.admin.confirmChallengeImport(doc);
-      this.importResult.set(result);
       this.statusMessage.set(summarizeImportResult(result));
       await this.load();
+      this.closeImport();
     } catch (e: any) {
-      this.importError.set(e?.error?.message ?? e?.message ?? 'Failed to import challenges');
+      this.importError.set(importErrorMessage(e, 'Failed to import challenges'));
     } finally {
       this.importing.set(false);
     }