- Introduced a new `pendingMonth` state in the app store to manage month transitions without clearing current data, enhancing user experience during month navigation.
- Updated `useMonthData` hook to load data for the `pendingMonth` when set, preventing empty-frame flicker and ensuring smooth month switching.
- Modified `CalendarPage` and `CalendarGrid` components to utilize the new `pendingMonth` state, improving the rendering logic during month changes.
- Enhanced `DutyList` to display a loading skeleton while data is being fetched, providing better feedback to users.
- Updated relevant tests to cover the new loading behavior and state management for month transitions.