Fixes #69837

Bug

After submitting the RSVP form, the confirmation message read directly from the live form state. This meant editing any input after submission (without resubmitting) would also update the already-displayed confirmation message, even though nothing was resubmitted.

Fix

Added a separate rsvpDetails state that snapshots the form data at the moment of submit (inside handleSubmit), and updated the confirmation message to render from that snapshot instead of the live formData. This freezes the confirmation at its originally submitted values regardless of further edits to the form.

Testing

Verified the behavior change in an isolated CodePen reproduction using the same component logic: submitted the form, then edited an input without resubmitting, and confirmed the confirmation message stayed frozen (previously it would update live).

Note

I noticed #69841 is already open addressing this same issue. Submitting this on freeCodeCamp's contribution workflow — happy to have this closed if that one merges first.

Checklist:

• [ x] I have read and followed the contribution guidelines.
• [ x] I have read and followed the how to open a pull request guide.
• [ x] My pull request targets the main branch of freeCodeCamp.
• I have tested these changes either locally on my machine, or GitHub Codespaces.

Closes #69837