feat(design): adopt CIBG component patterns (header, forms, wizards, dashboard)

Re-skins the app's layout on top of the CIBG Huisstijl theme (previous commit) so it
matches designsystem.cibg.nl, not just its colour tokens — magenta ("robijn") header,
horizontal nav, and the CIBG component markup for forms/wizards/dashboard.

- Header: logo block + robijn titlebar (breadcrumb + user menu) + grey horizontal nav
  (4 links) replacing the dashboard side-nav; breadcrumb restyled for the titlebar
  (no background of its own — CIBG's global `header nav` rule otherwise bleeds a grey
  fill into it, fixed by scoping an override inside BreadcrumbComponent).
- Forms: form-field/radio-group/checkbox rebuilt on CIBG's horizontal `form-group row`
  / `form-check.styled` markup (label col-md-4, control col-md-8); same input() APIs.
- Wizards: stepper rebuilt as the CIBG "stappenindicator" (numbered circles, visited
  steps clickable for back-nav, title merged in); wizard-shell adopts the CIBG
  procesnavigatie button row. Back-navigation wired into all three wizard machines
  (registratie-wizard already had it; added `GaNaarStap` to intake/herregistratie
  machines, pure + spec'd).
- New shared/ui molecules: confirmation (animated bevestiging checkmark, replaces
  plain alerts on submit), review-section (controlestap sections with "Wijzigen"),
  application-list/application-link (CIBG "aanvragen" rows, replace the dashboard's
  card grid and aanvraag-block).
- Cleanup: delete side-nav and now-unused styles.scss utilities (.app-overview,
  .app-form-panel, .app-card-grid); correct design-tokens.mdx (it referenced tokens
  that no longer exist) and document the CIBG-value token bridge.

Verified: build/lint/check:tokens green, 178 tests pass (4 new GaNaarStap cases), and
manually driven end-to-end (dashboard, a full herregistratie submission through to the
confirmation screen, mobile width, keyboard focus).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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

@@ -9,7 +9,11 @@ import { ButtonComponent } from '@shared/ui/button/button.component';
   selector: 'app-login-form',
   imports: [FormsModule, FormFieldComponent, TextInputComponent, ButtonComponent],
   template: `
-    <form (ngSubmit)="submitted.emit(bsn)" class="app-form app-form-panel">
+    <form (ngSubmit)="submitted.emit(bsn)" class="form-horizontal">
+      <div class="form-header">
+        <div class="form-action"><span class="meta" i18n="@@form.verplichteVelden">* verplichte velden</span></div>
+      </div>
+
       <app-form-field i18n-label="@@login.bsnLabel" label="BSN" fieldId="bsn" required i18n-description="@@login.bsnDescription" description="9 cijfers (demo: vul iets in)">
         <app-text-input inputId="bsn" [(ngModel)]="bsn" name="bsn" placeholder="123456789" />
       </app-form-field>