Use Object.defineProperty for HTMLAnchorElement.click mock to ensure proper override

Co-authored-by: renemadsen <76994+renemadsen@users.noreply.github.com>

Author: Copilot

eform-client/src/app/plugins/modules/time-planning-pn/components/plannings/time-planning-actions/download-excel/download-excel-dialog.component.spec.ts

@@ -22,7 +22,11 @@ describe('DownloadExcelDialogComponent', () => {
     global.URL.revokeObjectURL = jest.fn();
 
     // Mock HTMLAnchorElement.prototype.click to prevent navigation errors
-    HTMLAnchorElement.prototype.click = jest.fn();
+    const mockClick = jest.fn();
+    Object.defineProperty(HTMLAnchorElement.prototype, 'click', {
+      configurable: true,
+      value: mockClick,
+    });
 
     mockWorkingHoursService = {
       downloadReport: jest.fn(),