Add theme toggle and update MineGeo branding

app/layout.tsx

@@ -16,6 +16,8 @@ import "./polish.css";
 import "./mobile-game.css";
 import "./multiplayer.css";
 import "./support.css";
+import "./appearance.css";
+import { themeInitScript } from "@/shared/theme";
 import { SiteSettingsProvider } from "@/components/SiteSettingsProvider";
 import { initialSiteSettings } from "@/lib/site-settings";
 import { user } from "@/lib/supabase";
@@ -40,7 +42,10 @@ export default async function RootLayout({
   const [{ locale, preference, detectedLocale }, settings, account] =
     await Promise.all([getI18n(), initialSiteSettings(), user()]);
   return (
-    <html lang={locale}>
+    <html lang={locale} data-theme="dark" suppressHydrationWarning>
+      <head>
+        <script dangerouslySetInnerHTML={{ __html: themeInitScript }} />
+      </head>
       <body>
         <I18nProvider
           locale={locale}