Add dark mode, i18n, messenger/moderation/verify, admin CRUD parity

Web-tier features completing the AtomCMS→Next.js conversion (slice 2):

UI/UX:
- Dark mode: html.dark CSS-var overrides + ThemeSwitcher (localStorage,
  no-flash boot script) wired into the nav.
- i18n (next-intl, cookie-based / no URL routing): en + it catalogs,
  request.ts, provider in root layout, LanguageSwitcher; shell (nav,
  header, footer) fully translated. URLs + access-guard unchanged.
- globals.css: --muted/--border aliases used across admin pages.

User features:
- /messages: offline messages + friend-request accept (server action
  re-reads session, two directional rows, idempotent).
- Email verification: signed-token /verify route + sendVerification wired
  into register (best-effort, never blocks signup).
- Article reactions: toggle UI on news/[slug] + server action.
- Content moderation service (website_wordfilter + optional OpenAI
  moderations, fail-open) wired into article comments + guestbook.

Admin CRUD parity (Filament replacement):
- /admin/shop (+ new/[id]) packages CRUD + read-only orders.
- /admin/transactions read-only PayPal log.
- /admin/permissions, /admin/tags, /admin/ads (+ new/[id]),
  /admin/help-questions (+ new/[id]), /admin/radio/history,
  /admin/users/[id]/edit. All gated by requireStaff + logStaffActivity.

Verified: tsc 0, vitest 48/48, next build 0 (all routes incl. new
admin CRUD + /messages + /verify).

next.config.ts

@@ -1,4 +1,5 @@
 import type { NextConfig } from "next";
+import createNextIntlPlugin from "next-intl/plugin";
 
 const nextConfig: NextConfig = {
   // This app lives inside the Laravel repo tree (which has its own lockfiles);
@@ -9,4 +10,8 @@ const nextConfig: NextConfig = {
   serverExternalPackages: ["@prisma/adapter-mariadb", "mariadb", "@prisma/client"],
 };
 
-export default nextConfig;
+// next-intl WITHOUT i18n routing — locale comes from the NEXT_LOCALE cookie via
+// src/i18n/request.ts, so URLs and the access-guard middleware stay unchanged.
+const withNextIntl = createNextIntlPlugin("./src/i18n/request.ts");
+
+export default withNextIntl(nextConfig);