fix: infinite scroll sneller — rootMargin 1200px + 3 batches per trigger

Was: rootMargin=200px, 1 batch (50 items) per intersection trigger
→ bij snel scrollen moest je wachten of terugscrollen

Nu: rootMargin=1200px, tot 3 batches (150 items) per trigger
→ sentinel wordt 1200px eerder gedetecteerd, batches pre-loaden agressief
→ sentinel blijft ver voor de viewport, nooit meer wachten

docker/index.html

@@ -2771,9 +2771,16 @@ button:active, .btn:active, .meal-card-main:active, .dagboek-item:active, .food-
 
     searchObserver = new IntersectionObserver((entries) => {
       if (entries[0].isIntersecting) {
-        appendSearchBatch(allItems);
+        // Load up to 3 batches at once when user scrolls fast
+        // This keeps the sentinel pushed far ahead of the viewport
+        let batchesLoaded = 0;
+        const maxBatches = 3;
+        while (batchesLoaded < maxBatches && searchVisibleCount < allItems.length) {
+          appendSearchBatch(allItems);
+          batchesLoaded++;
+        }
       }
-    }, { rootMargin: '200px' });
+    }, { rootMargin: '1200px' });
 
     searchObserver.observe(sentinel);
   }