style: format frontend, docs and skills with prettier; add .prettierignore

One-time prettier --write so the new format:check CI gate starts green.
.prettierignore excludes generated (api-client.ts, documentation.json),
vendored (public/cibg-huisstijl), and backend (dotnet format owns it).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/registratie/infrastructure/dashboard-view.adapter.spec.ts

@@ -10,7 +10,11 @@ const valid = {
     geboortedatum: '1985-03-14',
     status: { tag: 'Geregistreerd', herregistratieDatum: '2027-03-01' },
   },
-  person: { naam: 'Dr. A. de Vries', geboortedatum: '1985-03-14', adres: { straat: 'X 1', postcode: '2514 EA', woonplaats: 'Den Haag' } },
+  person: {
+    naam: 'Dr. A. de Vries',
+    geboortedatum: '1985-03-14',
+    adres: { straat: 'X 1', postcode: '2514 EA', woonplaats: 'Den Haag' },
+  },
   decisions: { eligibleForHerregistratie: true, herregistratieReason: 'within window' },
 };
 
@@ -27,6 +31,8 @@ describe('parseDashboardView (trust boundary)', () => {
   it('rejects malformed responses instead of trusting them', () => {
     expect(parseDashboardView(null).ok).toBe(false);
     expect(parseDashboardView({ ...valid, registration: undefined }).ok).toBe(false);
-    expect(parseDashboardView({ ...valid, decisions: { eligibleForHerregistratie: 'yes' } }).ok).toBe(false);
+    expect(
+      parseDashboardView({ ...valid, decisions: { eligibleForHerregistratie: 'yes' } }).ok,
+    ).toBe(false);
   });
 });