Imporve image lazy loading

js/gallery-thumbnails.js

@@ -8,46 +8,15 @@
   // ============================================================
   // Gallery Thumbnails Module
   // ============================================================
+  // Thumbnail loading now relies on native loading="lazy" attribute.
+  // The browser handles deferred loading, connection limits, and
+  // automatic cancellation on navigation.
+  //
+  // This module is kept as a stub for potential future enhancements.
   Luxtools.GalleryThumbnails = (function () {
-    function loadThumb(img) {
-      var src = img.getAttribute('data-thumb-src') || '';
-      if (!src) return;
-      if (img.getAttribute('data-thumb-loading') === '1') return;
-      img.setAttribute('data-thumb-loading', '1');
-
-      var pre = new window.Image();
-      pre.onload = function () {
-        img.src = src;
-        img.removeAttribute('data-thumb-src');
-        img.removeAttribute('data-thumb-loading');
-      };
-      pre.onerror = function () {
-        img.removeAttribute('data-thumb-loading');
-      };
-      pre.src = src;
-    }
-
     function init() {
-      // Handle both gallery and imagebox thumbnails
-      var imgs = document.querySelectorAll('div.luxtools-gallery img[data-thumb-src], div.luxtools-imagebox img[data-thumb-src]');
-      if (!imgs || !imgs.length) return;
-
-      if ('IntersectionObserver' in window) {
-        var io = new window.IntersectionObserver(function (entries) {
-          entries.forEach(function (entry) {
-            if (!entry.isIntersecting) return;
-            loadThumb(entry.target);
-            io.unobserve(entry.target);
-          });
-        }, { rootMargin: '200px' });
-
-        imgs.forEach(function (img) { io.observe(img); });
-      } else {
-        // Fallback: load soon after initial render
-        window.setTimeout(function () {
-          imgs.forEach(loadThumb);
-        }, 0);
-      }
+      // Native lazy loading handles everything.
+      // No JavaScript intervention needed.
     }
 
     return {