feat: implement DOM virtualization for item cards in main and admin templates

Web/templates/main.html

@@ -751,6 +751,7 @@
     let mainItemsSentinel = null;
     let mainItemsLoadingIndicator = null;
     let mainItemsScrollPrefetchBound = false;
+    let cardVirtualizationObserver = null;
 
     function ensureMainItemsLoadingIndicator() {
         const itemsContainer = document.querySelector('#items-container');
@@ -1189,6 +1190,55 @@
             mainItemsScrollPrefetchBound = true;
         }
 
+        // Setup DOM virtualization for items
+        if (!cardVirtualizationObserver) {
+            cardVirtualizationObserver = new IntersectionObserver((entries) => {
+                entries.forEach(entry => {
+                    const card = entry.target;
+                    if (entry.isIntersecting) {
+                        if (card.dataset.deloaded === 'true') {
+                            card.innerHTML = card.dataset.savedHtml;
+                            card.dataset.deloaded = 'false';
+                            card.classList.remove('is-deloaded');
+                            const favBtn = card.querySelector('.bookmark-btn');
+                            if (favBtn) {
+                                favBtn.addEventListener('click', (ev) => {
+                                    ev.stopPropagation();
+                                    toggleFavorite(card.dataset.itemId, favBtn, card);
+                                });
+                            }
+                            const cardContent = card.querySelector('.card-content');
+                            if (cardContent) {
+                                cardContent.addEventListener('click', function(e) {
+                                    if (e.target.tagName === 'BUTTON' || e.target.tagName === 'A' || e.target.tagName === 'INPUT' ||
+                                        e.target.closest('button') || e.target.closest('a') || e.target.closest('.image-container')) return;
+                                    e.stopPropagation();
+                                    openItemQuick(card.dataset.itemId);
+                                });
+                            }
+                        }
+                    } else {
+                        if (card.dataset.deloaded !== 'true') {
+                            const rect = card.getBoundingClientRect();
+                            if (rect.height > 50) {
+                                card.style.minHeight = rect.height + 'px';
+                                card.dataset.itemId = card.querySelector('.card-content')?.dataset.itemId || '';
+                                card.dataset.savedHtml = card.innerHTML;
+                                card.innerHTML = '';
+                                card.dataset.deloaded = 'true';
+                                card.classList.add('is-deloaded');
+                            }
+                        }
+                    }
+                });
+            }, {
+                rootMargin: isMobileLayout ? '1500px 0px 1500px 0px' : '0px 2500px 0px 2500px'
+            });
+        }
+        
+        // Observe all valid cards
+        document.querySelectorAll('.item-card').forEach(card => cardVirtualizationObserver.observe(card));
+
         if (!mainItemsHasMore) return;
 
         mainItemsObserver = new IntersectionObserver(entries => {
@@ -2419,29 +2469,29 @@
     // Add these functions right after the loadFilterState() function
 
     function rebuildFilter3Options() {
-        if (!allItems || allItems.length === 0) return;
+        if (!allItems) return;
         
         // Get current filter 1 and filter 2 selections
         const filter1Selections = activeFilters.filter1;
         const filter2Selections = activeFilters.filter2;
         
-        // If both filters are empty, show all filter3 values
+        // If both filters are empty, show all filter3 values from server
         if (filter1Selections.length === 0 && filter2Selections.length === 0) {
-            // Get all unique filter3 values
-            const allFilter3Values = new Set();
+            // Include dynamically added ones from loaded items too, just in case
+            const combinedFilter3Values = new Set(typeof allFilter3Values !== 'undefined' ? [...allFilter3Values] : []);
             allItems.forEach(item => {
                 const filter3Array = Array.isArray(item.Filter3) ? item.Filter3 : 
                                    (item.Filter3 ? [item.Filter3] : []);
                 
                 filter3Array.forEach(value => {
                     if (value && typeof value === 'string' && value.trim() !== '') {
-                        allFilter3Values.add(value);
+                        combinedFilter3Values.add(value);
                     }
                 });
             });
             
             // Populate filter 3 dropdown with all values
-            populateFilterOptions('filter3-options', [...allFilter3Values].sort(), 3);
+            populateFilterOptions('filter3-options', [...combinedFilter3Values].sort(), 3);
             return;
         }
         
@@ -3114,6 +3164,8 @@
         cursor: pointer;
         transition: transform 0.2s, box-shadow 0.2s;
         position: relative;
+        content-visibility: auto;
+        contain-intrinsic-size: 300px 450px;
     }
     .item-card:hover {
         transform: translateY(-5px);

Web/templates/main_admin.html

@@ -403,6 +403,8 @@
         cursor: pointer;
         transition: transform 0.2s, box-shadow 0.2s;
         position: relative;
+        content-visibility: auto;
+        contain-intrinsic-size: 300px 450px;
     }
 
     .item-card.bulk-selected {
@@ -2876,30 +2878,29 @@ document.addEventListener('DOMContentLoaded', ()=>{
     }
 
     function rebuildFilter3Options() {
-        if (!allItems || allItems.length === 0) return;
+        if (!allItems) return;
         
         // Get current filter 1 and filter 2 selections
         const filter1Selections = activeFilters.filter1;
         const filter2Selections = activeFilters.filter2;
         
-        // If both filters are empty, show all filter3 values
+        // If both filters are empty, show all filter3 values from server
         if (filter1Selections.length === 0 && filter2Selections.length === 0) {
-            // Get all unique filter3 values
-            const allFilter3Values = new Set();
+            // Include dynamically added ones from loaded items too, just in case
+            const combinedFilter3Values = new Set(typeof allFilter3Values !== 'undefined' ? [...allFilter3Values] : []);
             allItems.forEach(item => {
                 const filter3Array = Array.isArray(item.Filter3) ? item.Filter3 : 
-                                     (item.Filter3 ? [item.Filter3] : []);
+                                   (item.Filter3 ? [item.Filter3] : []);
                 
                 filter3Array.forEach(value => {
                     if (value && typeof value === 'string' && value.trim() !== '') {
-                        allFilter3Values.add(value);
+                        combinedFilter3Values.add(value);
                     }
                 });
             });
             
             // Populate filter 3 dropdown with all values
-            populateFilterOptions('filter3-options', [...allFilter3Values].sort(), 3);
-            return;
+            populateFilterOptions('filter3-options', [...combinedFilter3Values].sort(), 3);
         }
         
         // Filter items based on filter1 and filter2 selections
@@ -3356,6 +3357,7 @@ document.addEventListener('DOMContentLoaded', ()=>{
     let mainAdminItemsLoadingIndicator = null;
     let mainAdminItemsScrollPrefetchBound = false;
     let totalItemsInSystem = 0;
+    let cardVirtualizationObserver = null;
 
     function ensureMainAdminItemsLoadingIndicator() {
         const itemsContainer = document.querySelector('#items-container');
@@ -3783,6 +3785,56 @@ document.addEventListener('DOMContentLoaded', ()=>{
             mainAdminItemsScrollPrefetchBound = true;
         }
 
+        // Setup DOM virtualization for items
+        if (!cardVirtualizationObserver) {
+            cardVirtualizationObserver = new IntersectionObserver((entries) => {
+                entries.forEach(entry => {
+                    const card = entry.target;
+                    if (entry.isIntersecting) {
+                        if (card.dataset.deloaded === 'true') {
+                            card.innerHTML = card.dataset.savedHtml;
+                            card.dataset.deloaded = 'false';
+                            card.classList.remove('is-deloaded');
+                            const favBtn = card.querySelector('.bookmark-btn');
+                            if (favBtn) {
+                                favBtn.addEventListener('click', (ev) => {
+                                    ev.stopPropagation();
+                                    toggleFavorite(card.dataset.itemId, favBtn, card);
+                                });
+                            }
+                            const cardContent = card.querySelector('.card-content');
+                            if (cardContent) {
+                                cardContent.addEventListener('click', function(e) {
+                                    if (e.target.tagName === 'BUTTON' || e.target.tagName === 'A' || e.target.tagName === 'INPUT' ||
+                                        e.target.closest('button') || e.target.closest('a') || e.target.closest('.image-container') ||
+                                        e.target.closest('.bulk-delete-toggle') || e.target.closest('label')) return;
+                                    e.stopPropagation();
+                                    openItemQuick(card.dataset.itemId);
+                                });
+                            }
+                        }
+                    } else {
+                        if (card.dataset.deloaded !== 'true') {
+                            const rect = card.getBoundingClientRect();
+                            if (rect.height > 50) {
+                                card.style.minHeight = rect.height + 'px';
+                                card.dataset.itemId = card.querySelector('.card-content')?.dataset.itemId || '';
+                                card.dataset.savedHtml = card.innerHTML;
+                                card.innerHTML = '';
+                                card.dataset.deloaded = 'true';
+                                card.classList.add('is-deloaded');
+                            }
+                        }
+                    }
+                });
+            }, {
+                rootMargin: isMobileLayout ? '1500px 0px 1500px 0px' : '0px 2500px 0px 2500px'
+            });
+        }
+        
+        // Observe all valid cards
+        document.querySelectorAll('.item-card').forEach(card => cardVirtualizationObserver.observe(card));
+
         if (!mainAdminItemsHasMore) return;
 
         mainAdminItemsObserver = new IntersectionObserver(entries => {