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/task-list/task-list.stories.ts

@@ -0,0 +1,22 @@
+import type { Meta, StoryObj } from '@storybook/angular';
+import { applicationConfig } from '@storybook/angular';
+import { provideRouter } from '@angular/router';
+import { TaskListComponent } from './task-list.component';
+
+const meta: Meta<TaskListComponent> = {
+  title: 'Molecules/Task List',
+  component: TaskListComponent,
+  decorators: [applicationConfig({ providers: [provideRouter([])] })],
+  render: (args) => ({ props: args, template: `<app-task-list [tasks]="tasks" />` }),
+};
+export default meta;
+type Story = StoryObj<TaskListComponent>;
+
+export const Default: Story = {
+  args: {
+    tasks: [
+      { title: 'Vraag uw herregistratie aan', description: 'Verleng uw registratie vóór 31 december 2026.', to: '/herregistratie', actionLabel: 'Herregistratie aanvragen' },
+      { title: 'Controleer uw adresgegevens', description: 'Uw adres is langer dan een jaar niet bevestigd.', to: '/registratie', actionLabel: 'Bekijk uw gegevens' },
+    ],
+  },
+};