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/spinner/spinner.component.ts

@@ -14,7 +14,7 @@ import { Component, OnDestroy, OnInit, input, signal } from '@angular/core';
   `],
   template: `
     @if (visible()) {
-      <div class="sp" role="status" aria-label="Bezig met laden"></div>
+      <div class="sp" role="status" i18n-aria-label="@@spinner.aria" aria-label="Bezig met laden"></div>
     }
   `,
 })