Update fun module configuration and enhance CSS styles

- Added 'enabled' property to FunConfigSchema with a default value of true for better configuration management.
- Refactored getFunConfig to return a complete default configuration when no data is found.
- Improved globals.css by expanding CSS variables for light and dark themes, enhancing styling consistency across the application.

apps/webui/src/components/layout/dashboard-shell.tsx

@@ -0,0 +1,30 @@
+import type { DashboardGuild, SessionUser } from '@nexumi/shared';
+import type { ReactNode } from 'react';
+import { ServerSwitcher } from './server-switcher';
+import { Sidebar } from './sidebar';
+import { UserMenu } from './user-menu';
+
+interface DashboardShellProps {
+  guildId: string;
+  currentGuild: DashboardGuild;
+  otherGuilds: DashboardGuild[];
+  user: SessionUser;
+  children: ReactNode;
+}
+
+export function DashboardShell({ guildId, currentGuild, otherGuilds, user, children }: DashboardShellProps) {
+  return (
+    <div className="flex min-h-screen">
+      <Sidebar guildId={guildId} />
+      <div className="flex flex-1 flex-col">
+        <header className="flex h-14 items-center justify-between border-b border-border px-6">
+          <ServerSwitcher currentGuild={currentGuild} otherGuilds={otherGuilds} />
+          <UserMenu user={user} />
+        </header>
+        <main className="flex-1 px-6 py-8">
+          <div className="mx-auto w-full max-w-[1200px]">{children}</div>
+        </main>
+      </div>
+    </div>
+  );
+}