Prevent users from scheduling events in the past by mistake

[Feandil]

Newdle currently doesn't seem to differentiate time slots in the past and in the future.

It could be useful to indicate to the user that they are selecting a day in the past, for which it would be too late to schedule anything. For example:

• Display a warning that the timeslot is in the past
• Grey-out options in the past, but letting the user select them
• Combination of the two previous points
• Grey-out options in the past, not letting the user select them (if proposing slots in the past is not considered a supported feature).

Thanks!