test: add delay wait for TimePicker handler in test case

- Add 150ms delay wait after time input change to ensure handler completes
- Fixes test case that was failing due to 0.1s delay in handleStartTimeChangeWithClose

__test__/components/EventModifications.test.tsx

@@ -408,6 +408,11 @@ describe("CalendarApp integration", () => {
         });
       });
 
+      // Wait for the 0.1s delay in handleStartTimeChangeWithClose to complete
+      await act(async () => {
+        await new Promise((resolve) => setTimeout(resolve, 150));
+      });
+
       const saveButton = screen.getByRole("button", { name: /save/i });
       await act(async () => {
         saveButton.click();