refactor: standardize env and analytics using enhanced @mintel/next-utils

apps/web/lib/env.ts

@@ -0,0 +1,34 @@
+import { z } from "zod";
+import { validateMintelEnv, mintelEnvSchema } from "@mintel/next-utils";
+
+/**
+ * Environment variable schema for the main website.
+ * Extends the default Mintel environment schema.
+ */
+export const envSchema = z.object({
+  ...mintelEnvSchema,
+
+  // Project specific overrides or additions
+  AUTH_COOKIE_NAME: z.string().default("mintel_gatekeeper_session"),
+
+  // Analytics provider toggle
+  NEXT_PUBLIC_ANALYTICS_PROVIDER: z
+    .enum(["plausible", "umami"])
+    .default("plausible"),
+
+  // Plausible specifics (to be standardized later if needed)
+  NEXT_PUBLIC_PLAUSIBLE_DOMAIN: z.string().default("mintel.me"),
+  NEXT_PUBLIC_PLAUSIBLE_SCRIPT_URL: z.string().url().optional(),
+});
+
+/**
+ * Validated environment object.
+ */
+export const env = validateMintelEnv(envSchema.shape);
+
+/**
+ * For legacy compatibility with existing code.
+ */
+export function getRawEnv() {
+  return env;
+}