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/lib/env.ts

@@ -0,0 +1,19 @@
+import { config } from 'dotenv';
+import { z } from 'zod';
+
+config();
+
+const EnvSchema = z.object({
+  NODE_ENV: z.enum(['development', 'test', 'production']).default('development'),
+  DATABASE_URL: z.string().url(),
+  REDIS_URL: z.string().url(),
+  BOT_CLIENT_ID: z.string().min(1),
+  BOT_CLIENT_SECRET: z.string().min(1),
+  WEBUI_URL: z.string().url().default('http://localhost:3000'),
+  SESSION_SECRET: z.string().min(32, 'SESSION_SECRET must be at least 32 characters long'),
+  SENTRY_DSN: z.string().optional(),
+  DEFAULT_LOCALE: z.enum(['de', 'en']).default('de')
+});
+
+export const env = EnvSchema.parse(process.env);
+export type Env = typeof env;