Step 2 (code quality): dedup + stop FE recomputing a server rule

- H1: tasksFromProfile takes the server's eligibleForHerregistratie decision
  instead of recomputing isHerregistratieEligible — the FE renders the rule,
  doesn't own it (ADR-0001). Policy reference impl kept for tests.
- M1: one shared runSubmit(fn, fallback) wrapper; the 4 submit-* commands keep
  only their payload mapping. +spec.
- M2: whenTag() kernel helper removes 10 repeated `as Extract<U,{tag}>` casts
  across the wizard/form components.

M4 (shared JA_NEE) folded into the upcoming i18n pass (clean dedup needs
$localize labels to sit in shared without breaking the English-shared-UI rule).
L1 already resolved by the restyle commit.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/registratie/application/submit-change-request.ts

@@ -1,22 +1,20 @@
-import { Result, ok, err } from '@shared/kernel/fp';
+import { Result } from '@shared/kernel/fp';
 import { Valid } from '@registratie/domain/change-request.machine';
 import { ApiClient } from '@shared/infrastructure/api-client';
-import { problemDetail } from '@shared/infrastructure/api-error';
+import { runSubmit, SUBMIT_FAILED } from '@shared/application/submit';
 
 /**
  * Command: POST an address change to the backend (`/api/v1/change-requests`),
  * which re-validates and returns a reference. Same shape as the other submit
  * commands — a `Result`, never a thrown error — so the form's reduce can branch.
  */
-export async function submitChangeRequest(client: ApiClient, data: Valid): Promise<Result<string, string>> {
-  try {
+export function submitChangeRequest(client: ApiClient, data: Valid): Promise<Result<string, string>> {
+  return runSubmit(async () => {
     const res = await client.changeRequests({
       straat: data.straat,
       postcode: data.postcode,
       woonplaats: data.woonplaats,
     });
-    return ok(res.referentie ?? '');
-  } catch (e) {
-    return err(problemDetail(e, 'Het indienen is niet gelukt. Probeer het later opnieuw.'));
-  }
+    return res.referentie ?? '';
+  }, SUBMIT_FAILED);
 }