Add niche admin + public expansions + self-host Nunito font (batches 3-4)

Built via two more parallel agent workflows (read schema -> return files),
integrated + verified.

Admin: /admin/emulator (emulator_settings + emulator_texts key/value editor),
/admin/badges (give-badge via RCON), /admin/rare-values (CRUD), /admin/housekeeping
(CRUD), /admin/email-templates (CRUD), /admin/photos (moderation).
Public: /rares (+[category]), /leaderboard (credits/diamonds/duckets),
/guilds (+[id] members), /redeem (voucher -> sendCurrency).
Expanded: /u/[username] now shows badges + photos + guestbook (post form);
/news/[slug] now shows reactions + comments (comment form). Reactions tallied
in JS (Prisma groupBy typing avoided).
Self-hosted Nunito via next/font/google wired to --font-nunito (the atom theme
font, no runtime external fetch). Header + admin nav extended.

Verified: tsc exit 0, vitest 48/48, next build exit 0.

src/app/layout.tsx

@@ -1,9 +1,18 @@
 import type { Metadata } from "next";
+import { Nunito } from "next/font/google";
 import type { ReactNode } from "react";
 import { SiteFooter } from "@/components/site-footer";
 import { SiteHeader } from "@/components/site-header";
 import "./globals.css";
 
+// Self-hosted (no runtime external fetch) — the atom theme's font.
+const nunito = Nunito({
+  subsets: ["latin"],
+  weight: ["400", "600", "700", "800"],
+  display: "swap",
+  variable: "--font-nunito",
+});
+
 export const metadata: Metadata = {
   title: "AtomCMS",
   description: "AtomCMS — retro hotel CMS (Next.js conversion)",
@@ -11,7 +20,7 @@ export const metadata: Metadata = {
 
 export default function RootLayout({ children }: { children: ReactNode }) {
   return (
-    <html lang="en">
+    <html lang="en" className={nunito.variable}>
       <body>
         <div style={{ display: "flex", flexDirection: "column", minHeight: "100vh" }}>
           <SiteHeader />