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/application/submit.ts

@@ -15,6 +15,6 @@ export async function runSubmit<T>(fn: () => Promise<T>, fallback: string): Prom
   }
 }
 
-// ponytail: i18n in Step 3/M3 wraps this in $localize with a stable @@id, which
-// dedupes it at the translation layer; for now it's the single shared default.
-export const SUBMIT_FAILED = 'Het indienen is niet gelukt. Probeer het later opnieuw.';
+// Single shared default for a failed submit; the @@id dedupes it at the
+// translation layer.
+export const SUBMIT_FAILED = $localize`:@@submit.failed:Het indienen is niet gelukt. Probeer het later opnieuw.`;