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/auth/ui/login-form/login-form.component.ts

@@ -9,18 +9,16 @@ import { ButtonComponent } from '@shared/ui/button/button.component';
   selector: 'app-login-form',
   imports: [FormsModule, FormFieldComponent, TextInputComponent, ButtonComponent],
   template: `
-    <form (ngSubmit)="submitted.emit(bsn)">
-      <app-form-field label="BSN" fieldId="bsn" description="9 cijfers (demo: vul iets in)">
+    <form (ngSubmit)="submitted.emit(bsn)" class="app-form app-form-panel">
+      <app-form-field label="BSN" fieldId="bsn" required description="9 cijfers (demo: vul iets in)">
         <app-text-input inputId="bsn" [(ngModel)]="bsn" name="bsn" placeholder="123456789" />
       </app-form-field>
 
-      <app-form-field label="Wachtwoord" fieldId="pw">
+      <app-form-field label="Wachtwoord" fieldId="pw" required>
         <app-text-input inputId="pw" type="password" [(ngModel)]="password" name="pw" />
       </app-form-field>
 
-      <div style="margin-top:1rem">
-        <app-button type="submit" variant="primary">Inloggen met DigiD</app-button>
-      </div>
+      <app-button type="submit" variant="primary">Inloggen met DigiD</app-button>
     </form>
   `,
 })