Rijkshuisstijl restyle + wizard fixes

Chrome: two-tier Rijksoverheid header (white brand bar + lint-blue
breadcrumb bar, route-driven), dark multi-column footer, white page
surface. Session shown via a shared SESSION_PORT token (keeps shared/
free of the auth context).

Overview ("Mijn overzicht") rebuilt to the NL Design System #392 pattern:
side-nav + "Wat moet ik regelen" task list (derived) + "Mijn registratie"
cards. New shared components: card, task-list, side-nav; pure
tasksFromProfile (+spec).

Wizards: grey form panel, connected numbered stepper, form-field
"(verplicht)" markers + styled description/error, full-width inputs.
Propagated to login, detail, change-request, address-fields.

Bug fixes:
- wizard-shell: add FormsModule so NgForm intercepts submit (wizards now
  advance; no native GET leaking choices into the URL).
- wizard-shell: error-summary links focus the field instead of navigating
  (a fragment href resolved against <base href="/"> reloaded to "/" and
  bounced to login).
- wizard-shell: error-summary focus only on the rising edge, so typing
  while errors are shown no longer scrolls the page up.

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

src/app/registratie/ui/registration-summary/registration-summary.component.ts

@@ -4,13 +4,14 @@ import { Registration } from '@registratie/domain/registration';
 import { statusColor, statusLabel } from '@registratie/domain/registration.policy';
 import { DataRowComponent } from '@shared/ui/data-row/data-row.component';
 import { StatusBadgeComponent } from '@shared/ui/status-badge/status-badge.component';
+import { CardComponent } from '@shared/ui/card/card.component';
 
 /** Organism: registration summary card. Composes data-row molecules + status-badge atom. */
 @Component({
   selector: 'app-registration-summary',
-  imports: [DatePipe, DataRowComponent, StatusBadgeComponent],
+  imports: [DatePipe, DataRowComponent, StatusBadgeComponent, CardComponent],
   template: `
-    <div class="rhc-card rhc-card--default">
+    <app-card>
       <dl class="rhc-data-summary rhc-data-summary--row">
         <app-data-row key="BIG-nummer" [value]="reg().bigNummer" />
         <app-data-row key="Naam" [value]="reg().naam" />
@@ -34,7 +35,7 @@ import { StatusBadgeComponent } from '@shared/ui/status-badge/status-badge.compo
           }
         }
       </dl>
-    </div>
+    </app-card>
   `,
 })
 export class RegistrationSummaryComponent {