Shuffle posts randomly on each page load

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

script.js

@@ -217,10 +217,19 @@ function renderCommentsList(comments) {
 // ===========================
 // RENDER CARDS
 // ===========================
+function shuffleArray(arr) {
+  for (let i = arr.length - 1; i > 0; i--) {
+    const j = Math.floor(Math.random() * (i + 1));
+    [arr[i], arr[j]] = [arr[j], arr[i]];
+  }
+  return arr;
+}
+
 function renderCards() {
   const grid = document.getElementById('postGrid');
   if (!grid) return;
 
+  shuffleArray(APP.posts);
   grid.innerHTML = APP.posts.map(p => {
     const liked = APP.userLikes.includes(p.id);
     const likeCount = APP.likes[p.id] || 0;