- Added `isSubmitting` state to prevent multiple submissions in AddContactController.
- Updated the `submitContact` method to handle submission state and validation.
- Refactored `AddContactBottomSheet` to utilize `BaseBottomSheet` for better UI consistency.
- Improved dynamic list handling for email and phone inputs in AddContactBottomSheet.
- Cleaned up controller initialization and field management in AddContactBottomSheet.
- Enhanced error handling and user feedback for required fields.