Fix XSS in uploadFailedSecond default case with escapeHtml

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/module/alertModal.js

@@ -402,7 +402,7 @@ export async function uploadFailedSecond(detail) {
             key = "Status";
             break;
           default:
-            key = i.loc[2];
+            key = escapeHtml(String(i.loc[2]));
             break;
         }
         content = `<li>Data missing in ${key} Column: (Row #${i.loc[1]})</li>`;