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/herregistratie/domain/herregistratie.machine.ts

@@ -38,11 +38,23 @@ export type WizardState =
   | { tag: 'Submitted'; data: Valid }
   | { tag: 'Failed'; data: Valid; error: string };
 
-export const initial: WizardState = { tag: 'Editing', step: 1, draft: { uren: '', jaren: '', punten: '' }, errors: {}, upload: initialUpload };
+export const initial: WizardState = {
+  tag: 'Editing',
+  step: 1,
+  draft: { uren: '', jaren: '', punten: '' },
+  errors: {},
+  upload: initialUpload,
+};
 
 /** Has the user meaningfully started, so it's worth persisting as a Concept? */
 export function hasProgress(s: Extract<WizardState, { tag: 'Editing' }>): boolean {
-  return s.step > 1 || !!s.draft.uren || !!s.draft.jaren || !!s.draft.punten || deliveryRefs(s.upload).some((r) => r.channel === 'digital' && !!r.documentId);
+  return (
+    s.step > 1 ||
+    !!s.draft.uren ||
+    !!s.draft.jaren ||
+    !!s.draft.punten ||
+    deliveryRefs(s.upload).some((r) => r.channel === 'digital' && !!r.documentId)
+  );
 }
 
 /** Parse every field; on success hand back a Valid, else the per-field errors. */
@@ -58,7 +70,15 @@ function validate(draft: Draft, upload: UploadState): Result<StepErrors, Valid>
     errors.documenten = $localize`:@@validation.documenten:Lever de verplichte documenten aan (upload of kies "per post nasturen").`;
   }
   if (uren.ok && jaren.ok && punten.ok && !errors.documenten) {
-    return { ok: true, value: { uren: uren.value, jaren: jaren.value, punten: punten.value, documents: deliveryRefs(upload) } };
+    return {
+      ok: true,
+      value: {
+        uren: uren.value,
+        jaren: jaren.value,
+        punten: punten.value,
+        documents: deliveryRefs(upload),
+      },
+    };
   }
   return { ok: false, error: errors };
 }
@@ -110,7 +130,9 @@ export function upload(s: WizardState, msg: UploadMsg): WizardState {
 /** Resolve the async submit. Only meaningful while Submitting. */
 export function resolve(s: WizardState, r: Result<string, void>): WizardState {
   if (s.tag !== 'Submitting') return s;
-  return r.ok ? { tag: 'Submitted', data: s.data } : { tag: 'Failed', data: s.data, error: r.error };
+  return r.ok
+    ? { tag: 'Submitted', data: s.data }
+    : { tag: 'Failed', data: s.data, error: r.error };
 }
 
 /** Update one draft field while editing; ignored in any other state. */