feat(site): redesign home, login and register with premium dark gaming theme

Replaced the classic Habbo landing style on the home, login and register pages with a modern premium dark-gaming look: always-dark hero canvas with brand glows, grid overlay and ambient orbs, glass panels, gradient text and floating art. Adds shared LandingTopBar, AuthShell and BrandFrank components plus reusable premium CSS utilities. Build, typecheck and lint pass.

src/components/landing-top-bar.tsx

@@ -0,0 +1,53 @@
+import Image from "next/image";
+import { Clock } from "@/components/clock";
+import { LanguageSwitcher } from "@/components/language-switcher";
+import { ThemeSwitcher } from "@/components/theme-switcher";
+
+/**
+ * Frosted top bar shared by the home hero and the premium auth pages.
+ * Dark-styled to sit on the "always-dark" landing canvas.
+ */
+export function LandingTopBar({
+	hotelName,
+	logo,
+}: {
+	hotelName: string;
+	logo?: string | null;
+}) {
+	return (
+		<div className="relative z-10 flex items-center justify-between gap-3 border-b border-white/10 px-4 py-3 sm:px-7 sm:py-4">
+			<div className="flex min-w-0 items-center gap-2.5 sm:gap-3">
+				{logo ? (
+					<Image
+						src={logo}
+						alt={hotelName}
+						width={110}
+						height={30}
+						className="shrink-0 object-contain"
+						unoptimized
+						style={{ maxHeight: 30, width: "auto", height: "auto" }}
+					/>
+				) : (
+					<Image
+						src="/assets/images/icons/lighthouse.png"
+						alt={hotelName}
+						width={30}
+						height={30}
+						className="shrink-0"
+						unoptimized
+					/>
+				)}
+				<span className="hidden truncate text-sm font-extrabold uppercase tracking-widest text-white/85 sm:inline">
+					{hotelName}
+				</span>
+			</div>
+			<div className="flex shrink-0 items-center gap-1 rounded-xl border border-white/10 bg-white/5 px-1.5 py-1 sm:px-2">
+				<LanguageSwitcher />
+				<div className="hidden h-5 w-px bg-white/15 sm:block" />
+				<Clock />
+				<div className="h-5 w-px bg-white/15" />
+				<ThemeSwitcher />
+			</div>
+		</div>
+	);
+}