Book for a Friend or Linked Account

Allow users to book classes for people linked to their account or for friends that dont have an account yet, using their credits.

Description:

1. Add an option: "Book for someone else" to the member's app

2. Let them select from linked accounts or choose "Someone else"

3. If "Someone Else" capture the email and name of the person so their account can be used (or added if not existing)

4. Charge the credits from the person who is making the booking

Benefits:

1. Increases class attendance.

2. Drives more credit usage.

3. Potentially attracts new users.

4. Enhances user flexibility and satisfaction.

Note: some clubs have memberships that include unlimited credits, yet they offer a specific number of guest passes per a billing period. We should account for that scenario as well.