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/shared/ui/form-field/form-field.component.ts

@@ -1,18 +1,27 @@
-import { Component, input } from '@angular/core';
+import { Component, booleanAttribute, input } from '@angular/core';
 
 /** Molecule: form field = label + projected control + optional error/description.
     Reused by both the login form and the change-request form. */
 @Component({
   selector: 'app-form-field',
+  styles: [`
+    :host{display:block}
+    .label{display:block;font-weight:var(--rhc-text-font-weight-semi-bold);margin-block-end:var(--rhc-space-max-sm)}
+    .req{font-weight:var(--rhc-text-font-weight-regular);color:var(--rhc-color-foreground-subtle)}
+    .desc{color:var(--rhc-color-foreground-subtle);font-size:var(--rhc-text-font-size-sm);margin-block-end:var(--rhc-space-max-sm)}
+    .error{color:var(--rhc-color-foreground-default);font-weight:var(--rhc-text-font-weight-semi-bold);margin-block-start:var(--rhc-space-max-sm);border-inline-start:var(--rhc-border-width-md) solid var(--rhc-color-rood-500);padding-inline-start:var(--rhc-space-max-md)}
+  `],
   template: `
     <div class="rhc-form-field utrecht-form-field" [class.utrecht-form-field--invalid]="!!error()">
-      <label class="utrecht-form-label" [id]="fieldId() + '-label'" [for]="fieldId()">{{ label() }}</label>
+      <label class="utrecht-form-label label" [id]="fieldId() + '-label'" [for]="fieldId()">
+        {{ label() }}@if (required()) { <span class="req">(verplicht)</span> }
+      </label>
       @if (description()) {
-        <div class="utrecht-form-field-description" [id]="fieldId() + '-desc'">{{ description() }}</div>
+        <div class="utrecht-form-field-description desc" [id]="fieldId() + '-desc'">{{ description() }}</div>
       }
       <ng-content />
       @if (error()) {
-        <div class="utrecht-form-field-error-message" [id]="fieldId() + '-error'" role="alert">{{ error() }}</div>
+        <div class="utrecht-form-field-error-message error" [id]="fieldId() + '-error'" role="alert">{{ error() }}</div>
       }
     </div>
   `,
@@ -22,4 +31,5 @@ export class FormFieldComponent {
   fieldId = input.required<string>();
   description = input<string>();
   error = input<string>();
+  required = input(false, { transform: booleanAttribute });
 }