fix: replace alert() with toast.error() in ExportPanel download error handler

Author: KaparthyReddy

app/customize/components/ExportPanel.tsx

@@ -1,4 +1,5 @@
 import { useState } from 'react';
+import { toast } from 'sonner';
 import type { ReactElement } from 'react';
 import type { ExportFormat } from '../types';
 import { getPlaceholderSnippet } from '../utils';
@@ -114,7 +115,7 @@ export function ExportPanel({
       URL.revokeObjectURL(downloadUrl);
     } catch (error) {
       console.error('Failed to download custom vector badge image asset:', error);
-      alert('Failed to download the badge asset directly from the server pipeline.');
+      toast.error('Failed to download badge. Please try again.');
     } finally {
       setIsDownloading(false);
     }