- Added functionality to check for date overlaps with existing absence requests in the absence calendar.
- Implemented a modal to display error messages when users attempt to create overlapping absence requests.
- Updated the calendar component to visually indicate blocked days due to existing approved or pending absence requests.
- Improved user feedback by providing alerts for unavailable periods and enhancing the overall user experience in absence management.
- Introduced a `required` prop in the `FileUpload` component to enforce mandatory file uploads.
- Enhanced error handling by implementing a modal for displaying error messages related to missing required fields and upload issues.
- Updated the `+page.svelte` file to integrate the new error modal and improve user feedback during form submissions.
- Ensured that all relevant file upload sections now validate the presence of documents before allowing form submission.
