Before this fix, a failed submit on the besluit-form or the
change-request-form left the user stuck. Both templates rendered `Failed`
through the same `@else` branch as the editable form. In besluit-form the
fields read from `Editing` only, so they went blank. In change-request-form
the fields still showed the sent value, but `SetField` only applies to
`Editing`, so typing did nothing. In both forms the submit button stayed
enabled, but `Submit` is a no-op outside `Editing`. The only escape was a
page reload.
After this fix, `Failed` gets its own template branch: an error message, a
read-only summary of what was sent (an `app-data-block`, reused from the
existing BRP-address pattern), and a "Opnieuw proberen" button that
dispatches `Retry`. Both machines already handle `Retry` (`Failed ->
Submitting` with the preserved data), so no machine change was needed.
Both components also move to `createStore`'s effect map (RD-05): the
`Submitting` handler replaces the hand-called `runIfSubmitting`, so
`onSubmit` is now a single `dispatch`. `runIfSubmitting`/`runIfIndienen`
now remain only in the three wizards, migrated later by RD-08.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
ehoandClaude Sonnet 5
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