[BUG] Cannot Remove Optional Donation After Selection During Event Registration

[dwhitig]

Description

When setting up an event with an optional donation field, the registration flow does not provide a way for the registrant to remove the donation amount once it has been selected and they've progressed to the next page.

Steps to Reproduce

1. Create an event in Summit Events with the Optional Donation feature enabled.
2. Begin registering for the event.
3. On the donation step, select a donation amount (or enter a custom amount).
4. Continue with the registration process.
5. Before completing registration, attempt to go back to the original page remove the donation amount (set to zero or deselect).

Expected Behavior

The registrant should have a clear option to remove or deselect the donation before submitting their registration — for example, by clearing the field, setting it to $0, or selecting “No donation.”

Actual Behavior

Once a donation amount is selected, there is no way to remove it within the registration flow. The registrant must either:

• Cancel their entire registration and start over, or
• Proceed with the unwanted donation amount.

Impact

• Causes user frustration and possible abandonment of registration.
• May lead to unintentional donations being processed.
• Reduces overall usability of the optional donation feature.

Workaround

Event administrators can add a $0 donation option to the optional donation list. This allows registrants to select $0 as a way of effectively removing a donation before completing registration.