fix: preserve form data on API error and fix test cases (#338)

- Add temp storage utility (eventFormTempStorage.ts) to save/restore form data
- Implement error handling: close modal immediately, reopen on API failure with saved data
- Add event listeners in Calendar.tsx and EventDisplayPreview.tsx to reopen modals on error
- Fix calendar change logic in EventUpdateModal: use oldCalendar for update before move
- Update all test mocks to support .unwrap() method for Redux thunks
- Add sessionStorage.clear() in test beforeEach hooks
- Fix test timing issues with act() wrappers and increased timeouts
- Mock putEventAsync in TempUpdate test to ensure updateTempCalendar is called

- Fix update modal not reopening when API fails for recurring events (solo/all)
- Move update modal reopen logic from EventDisplayPreview to Calendar.tsx
- Use sessionStorage to persist update modal info across component unmounts
- Handle typeOfAction matching for recurring events (undefined vs solo/all)
- Fix error handling in updateEventInstanceAsync and updateSeriesAsync
- Ensure all API failures properly dispatch eventModalError event

__test__/components/RepeatEvent.test.tsx

@@ -121,7 +121,11 @@ async function setupEventPopover(
 async function expectRRule(expected: Partial<RepetitionObject>) {
   const spy = jest
     .spyOn(eventThunks, "putEventAsync")
-    .mockImplementation((payload) => () => Promise.resolve(payload) as any);
+    .mockImplementation((payload) => {
+      const promise = Promise.resolve(payload);
+      (promise as any).unwrap = () => promise;
+      return () => promise as any;
+    });
   const saveButton = screen.getByRole("button", { name: /save/i });
   act(() => fireEvent.click(saveButton));
   await waitFor(() => expect(spy).toHaveBeenCalled());