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/domain/tasks.spec.ts

@@ -12,21 +12,20 @@ const base: Registration = {
 };
 
 describe('tasksFromProfile', () => {
-  it('offers herregistratie when within the deadline window', () => {
-    const tasks = tasksFromProfile(base, new Date('2026-06-27'));
+  it('offers herregistratie when the server says eligible, with the formatted deadline', () => {
+    const tasks = tasksFromProfile(base, true);
     expect(tasks).toHaveLength(1);
     expect(tasks[0].to).toBe('/herregistratie');
     expect(tasks[0].description).toContain('31 december 2026');
   });
 
-  it('offers nothing when the deadline is far away', () => {
-    const far: Registration = { ...base, status: { tag: 'Geregistreerd', herregistratieDatum: '2030-12-31' } };
-    expect(tasksFromProfile(far, new Date('2026-06-27'))).toHaveLength(0);
+  it('offers nothing when the server says not eligible', () => {
+    expect(tasksFromProfile(base, false)).toHaveLength(0);
   });
 
-  it('surfaces a notice for a suspended registration', () => {
+  it('surfaces a notice for a suspended registration (independent of eligibility)', () => {
     const reg: Registration = { ...base, status: { tag: 'Geschorst', geschorstTot: '2027-01-01', reden: 'Onderzoek' } };
-    const tasks = tasksFromProfile(reg, new Date('2026-06-27'));
+    const tasks = tasksFromProfile(reg, false);
     expect(tasks).toHaveLength(1);
     expect(tasks[0].title).toContain('geschorst');
     expect(tasks[0].description).toBe('Onderzoek');
@@ -34,7 +33,7 @@ describe('tasksFromProfile', () => {
 
   it('surfaces a notice for a struck-off registration', () => {
     const reg: Registration = { ...base, status: { tag: 'Doorgehaald', doorgehaaldOp: '2025-01-01', reden: 'Op eigen verzoek' } };
-    const tasks = tasksFromProfile(reg, new Date('2026-06-27'));
+    const tasks = tasksFromProfile(reg, false);
     expect(tasks).toHaveLength(1);
     expect(tasks[0].title).toContain('doorgehaald');
   });