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/herregistratie/ui/herregistratie-wizard/herregistratie-wizard.component.ts

@@ -35,16 +35,16 @@ import { ApiClient } from '@shared/infrastructure/api-client';
       (retry)="onRetry()">
 
       @if (step() === 1) {
-        <app-form-field label="Gewerkte uren (afgelopen 5 jaar)" fieldId="uren" [error]="errUren()">
+        <app-form-field label="Gewerkte uren (afgelopen 5 jaar)" fieldId="uren" required [error]="errUren()">
           <app-text-input inputId="uren" [ngModel]="draft().uren" (ngModelChange)="dispatch({ tag: 'SetField', key: 'uren', value: $event })"
             name="uren" [invalid]="!!errUren()" placeholder="bijv. 4160" />
         </app-form-field>
-        <app-form-field label="Aantal jaren werkzaam" fieldId="jaren" [error]="errJaren()">
+        <app-form-field label="Aantal jaren werkzaam" fieldId="jaren" required [error]="errJaren()">
           <app-text-input inputId="jaren" [ngModel]="draft().jaren" (ngModelChange)="dispatch({ tag: 'SetField', key: 'jaren', value: $event })"
             name="jaren" [invalid]="!!errJaren()" placeholder="bijv. 5" />
         </app-form-field>
       } @else {
-        <app-form-field label="Behaalde nascholingspunten" fieldId="punten" [error]="errPunten()">
+        <app-form-field label="Behaalde nascholingspunten" fieldId="punten" required [error]="errPunten()">
           <app-text-input inputId="punten" [ngModel]="draft().punten" (ngModelChange)="dispatch({ tag: 'SetField', key: 'punten', value: $event })"
             name="punten" [invalid]="!!errPunten()" placeholder="bijv. 200" />
         </app-form-field>