Centralize and standardize routing by introducing StaffPaths constants (shiftDetailsRoute, formI9, formW4) and using StaffPaths.childRoute in multiple staff feature modules instead of hardcoded paths. Add package:krow_core/core.dart imports where needed, clean up minor formatting/constructor spacing, make some route callbacks explicitly typed, replace shiftDetails string interpolation with the new constant, and remove a debug print from phone verification. These changes unify route definitions and add explicit tax-form routes (I-9 and W-4).
- Deleted the old availability_page_new.dart file.
- Updated the staff_availability_module.dart to import the new availability_page.dart.
- Added firebase_auth dependency in pubspec.yaml for authentication features.
- Created AvailabilityPage with UI for managing staff availability.
- Integrated BLoC for state management, including LoadAvailability and ToggleDayStatus events.
- Added quick set options for availability (All Week, Weekdays, Weekends, Clear All).
- Implemented week navigation and day selection with visual feedback.
- Developed time slot management for each day, allowing toggling of availability.
- Established StaffAvailabilityModule for dependency injection and routing.
- Updated pubspec.yaml with necessary dependencies for the feature.
