Afform - Add submit actions
Other form-builder libraries typically have some options for post-submit, e.g.
- Display a popup message to the user (maybe with token replacement).
- Display a full-screen message (replacing the body of the form).
- Redirect to another form/page.
All of those would be nice-to-have options.
#3 feels like the most critical (and also the easiest to code).
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