Enhanced Age Verification: Display Birthdate and Auto-Calculate Age During Ticket Scanning

[justusweigmann]

Is your feature request related to a problem? Please describe.
The current ticket scanning process in alf.io lacks the ability to display additional information about ticket holders, particularly for age-restricted tickets like children's tickets. This makes it difficult for operators to quickly verify if a child meets the age requirements, potentially leading to delays and inconsistencies in the entry process.

Describe the solution you'd like
We propose enhancing the ticket scanning functionality to:

1. Display additional information about the ticket holder during scanning, specifically the birthday for children's tickets.
2. Automatically calculate and show the ticket holder's age based on their birthday (implement this calculation at the time of ticket registration and update it in real-time for accuracy on the event day.).
3. Provide a prompt for operators to verify the child's age if necessary.

Describe alternatives you've considered
Using the Check-in supervisor role but here, the operators have to manually search for the ticket holder.

Additional context
This feature would significantly improve the efficiency of age verification for children's tickets and provide operators with valuable information at a glance. The user interface should be designed to present this information clearly while maintaining a quick and efficient scanning process.