fix: resolve lint errors in layout and route by updating analytics interface

app/[locale]/layout.tsx

@@ -118,8 +118,8 @@ export default async function RootLayout({
   const { headers } = await import("next/headers");
   const requestHeaders = await headers();
 
-  if ("setServerContext" in serverServices.analytics) {
-    (serverServices.analytics as any).setServerContext({
+  if (serverServices.analytics.setServerContext) {
+    serverServices.analytics.setServerContext({
       userAgent: requestHeaders.get("user-agent") || undefined,
       language:
         requestHeaders.get("accept-language")?.split(",")[0] || undefined,

app/api/contact/route.ts

@@ -10,8 +10,8 @@ export async function POST(req: Request) {
 
   // Set analytics context from request headers for high-fidelity server-side tracking
   // This fulfills the "server-side via nextjs proxy" requirement
-  if ("setServerContext" in services.analytics) {
-    (services.analytics as any).setServerContext({
+  if (services.analytics.setServerContext) {
+    services.analytics.setServerContext({
       userAgent: req.headers.get("user-agent") || undefined,
       language: req.headers.get("accept-language")?.split(",")[0] || undefined,
       referrer: req.headers.get("referer") || undefined,

lib/services/analytics/analytics-service.ts

@@ -73,4 +73,15 @@ export interface AnalyticsService {
    * ```
    */
   trackPageview(url?: string): void;
+
+  /**
+   * Set the server-side context for the current request.
+   * This is used for server-side tracking (e.g. from Next.js proxy).
+   */
+  setServerContext?(context: {
+    userAgent?: string;
+    language?: string;
+    referrer?: string;
+    ip?: string;
+  }): void;
 }

lib/services/analytics/noop-analytics-service.ts

@@ -68,4 +68,16 @@ export class NoopAnalyticsService implements AnalyticsService {
   trackPageview(_url?: string) {
     // intentionally noop - analytics are disabled
   }
+
+  /**
+   * No-op implementation of setServerContext.
+   */
+  setServerContext(_context: {
+    userAgent?: string;
+    language?: string;
+    referrer?: string;
+    ip?: string;
+  }) {
+    // intentionally noop - analytics are disabled
+  }
 }