fix(site): align star count formatting with GitHub official rounding

apps/site/src/components/hero.astro

@@ -209,10 +209,17 @@ const copy = siteCopy[locale].hero;
   (function () {
     function formatCount(count) {
       if (typeof count !== "number") return String(count);
-      if (count >= 1000) {
-        return (count / 1000).toFixed(1).replace(/\.0$/, "") + "k";
+      try {
+        return new Intl.NumberFormat("en", {
+          notation: "compact",
+          maximumFractionDigits: 1,
+        }).format(count).toLowerCase();
+      } catch (e) {
+        if (count >= 1000) {
+          return (Math.round(count / 100) / 10).toFixed(1).replace(/\.0$/, "") + "k";
+        }
+        return count.toLocaleString();
       }
-      return count.toLocaleString();
     }
 
     async function fetchGitHubStats() {