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/registratie/ui/registration-summary/registration-summary.stories.ts

@@ -23,8 +23,18 @@ export const Geregistreerd: Story = {
   args: { reg: { ...base, status: { tag: 'Geregistreerd', herregistratieDatum: '2027-09-01' } } },
 };
 export const Geschorst: Story = {
-  args: { reg: { ...base, status: { tag: 'Geschorst', geschorstTot: '2026-12-31', reden: 'Lopend tuchtonderzoek' } } },
+  args: {
+    reg: {
+      ...base,
+      status: { tag: 'Geschorst', geschorstTot: '2026-12-31', reden: 'Lopend tuchtonderzoek' },
+    },
+  },
 };
 export const Doorgehaald: Story = {
-  args: { reg: { ...base, status: { tag: 'Doorgehaald', doorgehaaldOp: '2024-05-01', reden: 'Op eigen verzoek' } } },
+  args: {
+    reg: {
+      ...base,
+      status: { tag: 'Doorgehaald', doorgehaaldOp: '2024-05-01', reden: 'Op eigen verzoek' },
+    },
+  },
 };