Enables dry-run checking before committing to case adoption. The preflight
shares the same side-effect-free checks (steps 1–3) as the real take-ownership
handler, so it cannot drift from what will actually succeed. Returns the same
status codes and error shapes as the real endpoint (200 with wouldSucceed:true,
or 409/404/422 if it would fail).
Portal renders a "Vooraf controleren" button for legacy cases, surfaced through
the existing actions block pattern. Confirmed in smoke.sh with two cases: one
where preflight predicts success (and writes nothing), one where it predicts
a named invariant failure (matching what the real call reproduces).
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Shared form for writeThrough and owned modes. Shows the ADR-002
disclaimer only in writeThrough mode (no client-side validation
stricter than legacy provides). Maps 400 ErrorsResponse to per-field
inline errors, 422/409 to a banner with the server's own text -
never a client-side switch over invariant names. Embedded in
case-detail with reload() on save so the actions block refreshes.
ehoandClaude Haiku 4.5