refactor: migrate legacy wire namespace to wrn

examples/auth-showcase/app/pages/impersonation.wrn

@@ -1,4 +1,4 @@
 page ImpersonationPage {
   seo { title = "Impersonation safety banner" }
-  view { <main class="min-h-screen bg-[var(--wire-color-bg)] text-[var(--wire-color-text)]"><ImpersonationBanner targetName="Demo Customer" /><div class="mx-auto max-w-4xl p-8"><h1 class="text-3xl font-bold">Support impersonation</h1><p class="text-[var(--wire-color-muted)]">The banner remains visible while an audited support session is active.</p></div></main> }
+  view { <main class="min-h-screen bg-[var(--wrn-color-bg)] text-[var(--wrn-color-text)]"><ImpersonationBanner targetName="Demo Customer" /><div class="mx-auto max-w-4xl p-8"><h1 class="text-3xl font-bold">Support impersonation</h1><p class="text-[var(--wrn-color-muted)]">The banner remains visible while an audited support session is active.</p></div></main> }
 }