feat: add admin batch file selection

src/i18n/locales/en-US.ts

@@ -418,7 +418,17 @@ export default {
     previewComplete: 'Loaded full content, {count} characters',
     previewTruncated: 'Showing {shown} / {total} characters',
     previewFallback: 'Preview endpoint unavailable; using text from the list',
+    selectCurrentPage: 'Select current page',
+    selectedCount: '{count} selected',
+    selectFile: 'Select {name}',
+    clearSelection: 'Clear Selection',
+    batchDelete: 'Batch Delete',
+    batchDeleteConfirm: 'Delete the selected {count} files? This action cannot be undone.',
+    batchDeleteSuccess: 'Deleted {count} files',
+    batchDeletePartialSuccess: 'Deleted {count} files, {failed} failed',
+    batchDeleteFailed: 'Batch delete failed',
     headers: {
+      select: 'Select',
       code: 'Retrieve Code',
       name: 'Name',
       type: 'Type',