feat(analytics): implement advanced tracking with script-less smart proxy

- Added Umami Smart Proxy route handler
- Refactored Umami adapter to use proxy-based fetch
- Implemented TrackedButton, TrackedLink, and ScrollDepthTracker
- Integrated event tracking into ContactForm
- Enhanced Analytics component with manual pageview and performance tracking

apps/web/next.config.mjs

@@ -19,10 +19,7 @@ const nextConfig = {
       : "https://errors.infra.mintel.me";
 
     return [
-      {
-        source: "/stats/:path*",
-        destination: `${umamiUrl}/:path*`,
-      },
+      // Umami proxy rewrite removed in favor of app/stats/api/send/route.ts
       {
         source: "/errors/:path*",
         destination: `${glitchtipUrl}/:path*`,