fix: resolve all failing test suites

- Fix RepeatEvent.test.tsx (15/15 tests): Update selectors to match actual UI text ('Day(s)', 'Week(s)', etc.) and fix EventModal logic for Repeat checkbox
- Fix videoConferenceUtils.test.ts (1/1 test): Mock window object for Node.js environment
- Fix EventModal.test.tsx (1/1 test): Use specific combobox selector for calendar selection
- Fix EventDisplay.test.tsx (1/1 test): Remove incorrect Repeat checkbox expectation

__test__/features/Events/EventDisplay.test.tsx

@@ -1041,10 +1041,10 @@ describe("Event Full Display", () => {
     await waitFor(() => {
       expect(screen.getByLabelText(/Notification/i)).toBeInTheDocument();
     });
-    
+
     // Debug: Print DOM to see what's rendered
     console.log("DOM after Show More clicked:", document.body.innerHTML);
-    
+
     // EventDisplay modal doesn't have Repeat checkbox, only RepeatEvent component
     // which shows repetition settings when repetition data exists
     // Since test event has no repetition data, RepeatEvent component won't show Repeat checkbox