fix: Prevent past time bookings in BookingEditor

Слиты opensource-effective-dev запросил слияние feature/bookingeditor-past-time-validation в develop

Created by: KrugarValdes

  • Added isTimeInPast check in onDateTimeChanged and updateEventDetails to compare the selected event time (newDate) against the current time (getCurrentTime()).
  • Updated the state to include isTimeInPastError to indicate if the selected time is in the past.
  • Added a SnackbarHostState to manage snackbar notifications.
  • Used LaunchedEffect to display a snackbar with the is_time_in_past_error message when isTimeInPastError is true.