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/auth/ui/login-form/login-form.component.ts

@@ -11,10 +11,19 @@ import { ButtonComponent } from '@shared/ui/button/button.component';
   template: `
     <form (ngSubmit)="submitted.emit(bsn)" class="form-horizontal">
       <div class="form-header">
-        <div class="form-action"><span class="meta" i18n="@@form.verplichteVelden">* verplichte velden</span></div>
+        <div class="form-action">
+          <span class="meta" i18n="@@form.verplichteVelden">* verplichte velden</span>
+        </div>
       </div>
 
-      <app-form-field i18n-label="@@login.bsnLabel" label="BSN" fieldId="bsn" required i18n-description="@@login.bsnDescription" description="9 cijfers (demo: vul iets in)">
+      <app-form-field
+        i18n-label="@@login.bsnLabel"
+        label="BSN"
+        fieldId="bsn"
+        required
+        i18n-description="@@login.bsnDescription"
+        description="9 cijfers (demo: vul iets in)"
+      >
         <app-text-input inputId="bsn" [(ngModel)]="bsn" name="bsn" placeholder="123456789" />
       </app-form-field>
 
@@ -22,7 +31,9 @@ import { ButtonComponent } from '@shared/ui/button/button.component';
         <app-text-input inputId="pw" type="password" [(ngModel)]="password" name="pw" />
       </app-form-field>
 
-      <app-button type="submit" variant="primary" i18n="@@login.submit">Inloggen met DigiD</app-button>
+      <app-button type="submit" variant="primary" i18n="@@login.submit"
+        >Inloggen met DigiD</app-button
+      >
     </form>
   `,
 })