style: format frontend, docs and skills with prettier; add .prettierignore

One-time prettier --write so the new format:check CI gate starts green.
.prettierignore excludes generated (api-client.ts, documentation.json),
vendored (public/cibg-huisstijl), and backend (dotnet format owns it).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/app/shared/layout/breadcrumb/breadcrumb.stories.ts

@@ -17,8 +17,19 @@ export default meta;
 type Story = StoryObj<BreadcrumbComponent>;
 
 export const TweeNiveaus: Story = {
-  args: { items: [{ label: 'Mijn omgeving', link: '/dashboard' }, { label: 'Inschrijven in het BIG-register' }] },
+  args: {
+    items: [
+      { label: 'Mijn omgeving', link: '/dashboard' },
+      { label: 'Inschrijven in het BIG-register' },
+    ],
+  },
 };
 export const DrieNiveaus: Story = {
-  args: { items: [{ label: 'Mijn omgeving', link: '/dashboard' }, { label: 'Registratie', link: '/registratie' }, { label: 'Inschrijven' }] },
+  args: {
+    items: [
+      { label: 'Mijn omgeving', link: '/dashboard' },
+      { label: 'Registratie', link: '/registratie' },
+      { label: 'Inschrijven' },
+    ],
+  },
 };