Refactor layout and home page for improved localization and session handling

- Updated RootLayout to include locale support and integrated ThemeProvider and LocaleProvider for better internationalization.
- Replaced static home page content with a redirect based on user session status, enhancing user experience by directing to the appropriate dashboard or login page.
- Switched font from Geist to Inter for improved typography consistency.

apps/webui/src/app/dashboard/[guildId]/layout.tsx

@@ -0,0 +1,29 @@
+import { notFound } from 'next/navigation';
+import type { ReactNode } from 'react';
+import { DashboardShell } from '@/components/layout/dashboard-shell';
+import { requireGuildAccessOrRedirect } from '@/lib/auth';
+import { getManageableGuilds } from '@/lib/guilds';
+
+interface GuildLayoutProps {
+  children: ReactNode;
+  params: Promise<{ guildId: string }>;
+}
+
+export default async function GuildLayout({ children, params }: GuildLayoutProps) {
+  const { guildId } = await params;
+  const session = await requireGuildAccessOrRedirect(guildId);
+  const guilds = await getManageableGuilds(session);
+  const currentGuild = guilds.find((guild) => guild.id === guildId);
+
+  if (!currentGuild) {
+    notFound();
+  }
+
+  const otherGuilds = guilds.filter((guild) => guild.id !== guildId);
+
+  return (
+    <DashboardShell guildId={guildId} currentGuild={currentGuild} otherGuilds={otherGuilds} user={session.user}>
+      {children}
+    </DashboardShell>
+  );
+}