chore: fix type check for i18n (#30058)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: yyh <yuanyouhuilyz@gmail.com>

web/app/components/workflow/nodes/loop/components/loop-variables/item.tsx

@@ -30,7 +30,7 @@ const Item = ({
     if (!isValid) {
       Toast.notify({
         type: 'error',
-        message: t(`appDebug.varKeyError.${errorMessageKey}`, { key: t('workflow.env.modal.name') }),
+        message: t(`appDebug.varKeyError.${errorMessageKey}` as any, { key: t('workflow.env.modal.name') }) as string,
       })
       return false
     }