UI gaps: radio player widget, logo generator, public room page

Phase D of the parity push:
- Radio player: fixed bottom-right widget (port of atom's radio-player.blade)
  that streams the hotel radio via <audio>, with play/pause, volume, current
  DJ / now-playing and live listener count, polling the public API every 15s.
  A server gate (RadioPlayerGate) only mounts it when radio is enabled + a
  stream URL is set, so no widget JS ships when off. Mounted in the layout.
- Logo generator (/logo): client tool — hotel name + font/colour/size pickers
  with a live preview and "download PNG" via canvas.
- Public room page (/room/[id]): renders an emulator room (name, owner,
  users/max, state, category) in a ContentCard.

Verified live (prod, amx_test): /logo renders the generator, /room/50 shows
the real room "Dark Elegant Bundle", and with radio enabled the player
mounts fixed bottom-right (audio + play/pause + Test FM); reverted the test
settings. tsc 0, vitest 49/49, next build 0.

src/app/logo/page.tsx

@@ -0,0 +1,24 @@
+import { ContentCard } from "@/components/public/ui";
+import LogoGenerator from "@/components/public/logo-generator";
+
+export const metadata = { title: "Logo generator" };
+
+/**
+ * Public logo generator (AtomCMS logo-generator.blade). Server wrapper that
+ * renders the atom-styled ContentCard header and hands off to the fully
+ * client-side <LogoGenerator>, which does all styling, live preview, and PNG
+ * export in the browser (no server data, no DB).
+ */
+export default function LogoPage() {
+  return (
+    <main style={{ display: "grid", gap: "1.5rem", maxWidth: 920, margin: "0 auto" }}>
+      <ContentCard
+        icon="🎨"
+        title="Logo generator"
+        subtitle="Design a logo for your hotel — pick a font, colours and size, then download it as a PNG."
+      />
+
+      <LogoGenerator />
+    </main>
+  );
+}