fix(clipart): Add await to clipart cache generation to fix race condition

- Changed fileHelper.generateClipartCache() to await fileHelper.generateClipartCache()
- Ensures cache is fully generated before UI accesses it
- Fixes issue #1605 where saved clipart doesn't appear on first app restart

Author: Phanindra899

lib/view/draw_badge_screen.dart

@@ -253,7 +253,7 @@ class _DrawBadgeState extends State<DrawBadge> {
           await fileHelper.saveImage(drawToggle.getDrawViewGrid());
         }
 
-        fileHelper.generateClipartCache();
+        await fileHelper.generateClipartCache();
         ToastUtils().showToast(GetIt.instance
             .get<LocalizationService>()
             .l10n