Step 2 (i18n): $localize sweep + JA_NEE dedup (M3, M4)

Wrap every user-facing Dutch string in Angular's first-party i18n — `i18n`/
`i18n-<attr>` in templates, `$localize` in TS (value-objects, machines, commands,
label constants, shared-component defaults). Source locale stays nl; a second
locale is now a translation file, not a code change.

- M3: ~145 strings localized with stable @@ ids across registratie,
  herregistratie, auth, shared/ui, shared/layout. Skipped: showcase, debug-state,
  scenario interceptor, generated client, specs/stories, raw status enum tags,
  internal parse* diagnostics.
- M4: single shared JA_NEE (localized labels) in radio-group; both wizard copies
  removed.

Gate green: lint, check:tokens, build, test 77/77.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/shared/ui/radio-group/radio-group.component.ts

@@ -6,6 +6,13 @@ export interface RadioOption {
   label: string;
 }
 
+/** The ubiquitous yes/no option pair. Language-agnostic now the labels are
+    localized, so it lives next to RadioOption and both wizards import it. */
+export const JA_NEE: RadioOption[] = [
+  { value: 'ja', label: $localize`:@@common.ja:Ja` },
+  { value: 'nee', label: $localize`:@@common.nee:Nee` },
+];
+
 /** Atom: a radio group. Thin wrapper over the Utrecht/RHC radio CSS, wired as a
     form control so it works with ngModel just like the text-input atom. */
 @Component({