perf(home): parallelize private visitor tracking

app/page.tsx

@@ -3,39 +3,23 @@ import { Card, CardHeader } from "@/components/ui/card";
 import Image from "next/image";
 import { getFollowerCounts } from "@/lib/followers";
 import { LinkCard } from "@/components/LinkCard";
-import { getRedisClient } from "@/lib/redis";
 import { headers } from "next/headers";
-import { connection } from "next/server";
 import { Users } from "lucide-react";
 import { Kbd } from "@/components/ui/kbd";
 import Background from "@/public/background/space.webp";
+import { trackUniqueVisitor } from "@/lib/visitor/unique-visitors";
 
 export default async function Home() {
-  await connection();
-
-  const { counts } = await getFollowerCounts();
-  
-  const headersList = await headers();
-  const ip = headersList.get("x-forwarded-for") || headersList.get("x-real-ip") || "unknown";
-  
-  let visitorCount = 0;
-  try {
-    const redis = await getRedisClient();
-    if (ip !== "unknown") {
-      const added = await redis.sadd("erika:unique_visitors", ip);
-      if (added > 0) {
-        // New visitor — refresh the count
-        visitorCount = await redis.scard("erika:unique_visitors");
-      } else {
-        // Existing visitor — use cached count or fetch
-        visitorCount = await redis.scard("erika:unique_visitors");
-      }
-    } else {
-      visitorCount = await redis.scard("erika:unique_visitors");
-    }
-  } catch (e) {
-    console.error("Failed to track visitor:", e);
-  }
+  const visitorCountPromise = headers()
+    .then(trackUniqueVisitor)
+    .catch((error) => {
+      console.error("Failed to track visitor:", error);
+      return 0;
+    });
+  const [{ counts }, visitorCount] = await Promise.all([
+    getFollowerCounts(),
+    visitorCountPromise,
+  ]);
 
   // Use configured profile data.
   const profileName = config.profile.name;