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).

src/components/navigation.tsx

@@ -1,8 +1,12 @@
+import { getTranslations } from "next-intl/server";
 import Link from "next/link";
 import { auth } from "@/lib/auth";
+import { LanguageSwitcher } from "@/components/language-switcher";
+import { ThemeSwitcher } from "@/components/theme-switcher";
 
 export async function Navigation() {
   const session = await auth();
+  const t = await getTranslations("nav");
   const isStaff = (session?.user?.rank ?? 0) >= 7;
 
   return (
@@ -10,87 +14,96 @@ export async function Navigation() {
       <div className="max-w-7xl min-h-[60px] px-4 flex items-center gap-x-6 md:gap-x-8 mx-auto flex-wrap">
         <Link href="/" className="nav-item">
           <i className="navigation-icon home mr-1 hidden lg:inline-flex" />
-          Home
+          {t("home")}
         </Link>
 
         <details className="relative">
           <summary className="nav-item list-none cursor-pointer [&::-webkit-details-marker]:hidden">
             <i className="navigation-icon community mr-1 hidden lg:inline-flex" />
-            Community
+            {t("community")}
           </summary>
           <div
             className="absolute left-0 mt-1 min-w-[190px] rounded-md shadow-lg z-50 py-1"
             style={{ backgroundColor: "var(--color-dropdown)" }}
           >
             <Link href="/news" className="dropdown-item">
-              Articles
+              {t("articles")}
             </Link>
             <Link href="/photos" className="dropdown-item">
-              Photos
+              {t("photos")}
             </Link>
             <Link href="/staff" className="dropdown-item">
-              Staff
+              {t("staff")}
             </Link>
             <Link href="/rankings" className="dropdown-item">
-              Rankings
+              {t("rankings")}
             </Link>
             <Link href="/guilds" className="dropdown-item">
-              Guilds
+              {t("guilds")}
             </Link>
           </div>
         </details>
 
         <Link href="/leaderboard" className="nav-item">
           <i className="navigation-icon leaderboards mr-1 hidden lg:inline-flex" />
-          Leaderboards
+          {t("leaderboards")}
         </Link>
         <Link href="/rares" className="nav-item">
-          Rare values
+          {t("rareValues")}
         </Link>
         <Link href="/shop" className="nav-item">
           <i className="navigation-icon shop mr-1 hidden lg:inline-flex" />
-          Shop
+          {t("shop")}
         </Link>
         <Link href="/marketplace" className="nav-item">
-          Market
+          {t("market")}
         </Link>
 
         <details className="relative">
           <summary className="nav-item list-none cursor-pointer [&::-webkit-details-marker]:hidden">
             <i className="navigation-icon rules mr-1 hidden lg:inline-flex" />
-            Assistance
+            {t("assistance")}
           </summary>
           <div
             className="absolute left-0 mt-1 min-w-[190px] rounded-md shadow-lg z-50 py-1"
             style={{ backgroundColor: "var(--color-dropdown)" }}
           >
             <Link href="/help" className="dropdown-item">
-              Help center
+              {t("helpCenter")}
             </Link>
             {session?.user ? (
               <Link href="/help/tickets" className="dropdown-item">
-                My tickets
+                {t("myTickets")}
               </Link>
             ) : null}
             <Link href="/badges" className="dropdown-item">
-              Badges
+              {t("badges")}
             </Link>
           </div>
         </details>
 
         <Link href="/radio" className="nav-item">
-          Radio
+          {t("radio")}
         </Link>
         {session?.user ? (
           <Link href="/friends" className="nav-item">
-            Friends
+            {t("friends")}
+          </Link>
+        ) : null}
+        {session?.user ? (
+          <Link href="/messages" className="nav-item">
+            {t("messages")}
           </Link>
         ) : null}
         {isStaff ? (
           <Link href="/admin" className="nav-item">
-            Admin
+            {t("admin")}
           </Link>
         ) : null}
+        <div className="ml-auto flex items-center gap-x-2">
+          <LanguageSwitcher />
+          <ThemeSwitcher />
+        </div>
       </div>
     </nav>
   );