Update packages/bigframes/bigframes/display/table_widget_angular/src/app/app.ts

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: shuoweil

packages/bigframes/bigframes/display/table_widget_angular/src/app/app.ts

@@ -411,7 +411,7 @@ export class App {
     const headerDiv = header.querySelector('div.bf-header-content');
     if (!headerDiv) return;
 
-    const columnName = headerDiv.textContent?.trim() || '';
+    const columnName = this.getColumnName(headerDiv);
     const sortableColumns = this.state.orderableColumns();
     if (!columnName || !sortableColumns.includes(columnName)) return;