- Updated `user_document_controller.dart` to use DateTime for start and end dates.
- Enhanced `daily_task_controller.dart` with Rx fields for date range and added methods to update date ranges.
- Reverted API base URL in `api_endpoints.dart` to stage environment.
- Introduced `date_range_picker.dart` widget for reusable date selection.
- Integrated `DateRangePickerWidget` in attendance and daily task filter bottom sheets.
- Simplified date range selection logic in `attendance_filter_sheet.dart`, `daily_progress_report_filter.dart`, and `user_document_filter_bottom_sheet.dart`.
- Updated expense filter bottom sheet to utilize the new date range picker.
