Add optional chaining for uploadDetail.value.columns in submit()

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

src/views/Upload/UploadPage.vue

@@ -402,7 +402,7 @@ async function submit() {
   };
   // Assign values
   const haveValueData = selectedColumns.value.map((column, i) => {
-    if (column && uploadDetail.value.columns[i]) {
+    if (column && uploadDetail.value?.columns?.[i]) {
       return {
         name: column.name,
         code: column.code,