修复动画掉帧的问题，增加昼夜切换的过渡动画

themes/Ying/assets/js/modules/infinite-scroll.js

@@ -63,17 +63,21 @@ window.initInfiniteScroll = function() {
             // 1. Get new posts
             const newPosts = doc.querySelectorAll(`${containerSelector} ${itemSelector}`);
             
-            // 2. Append posts
+            // 2. Append posts with batch layout read/write to avoid thrashing
             if (newPosts.length > 0) {
-                newPosts.forEach(post => {
-                    // Remove UIkit scrollspy attributes to prevent interference and use manual animation
+                // Phase 1: append all and set initial opacity
+                newPosts.forEach(function(post) {
                     post.removeAttribute('uk-scrollspy-class');
                     post.style.opacity = 0;
                     container.appendChild(post);
-                    
-                    // Trigger reflow
-                    void post.offsetWidth;
-                    
+                });
+
+                // Phase 2: force single layout read for all new posts
+                var postArr = Array.prototype.slice.call(newPosts);
+                postArr.forEach(function(post) { void post.offsetWidth; });
+
+                // Phase 3: batch animate in
+                postArr.forEach(function(post) {
                     post.style.transition = 'opacity 0.5s ease';
                     post.style.opacity = 1;
                 });