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) {
+        // 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);
   }

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) {
+        // 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);
   }

tests/e2e.spec.js

@@ -456,14 +456,14 @@ test.describe('Karby Eetdagboek', () => {
     // Sentinel should exist (there are more than 50 items)
     await expect(page.locator('#searchSentinel')).toBeAttached({ timeout: 3000 });
 
-    // Scroll sentinel into view to trigger next batch
+    // Scroll sentinel into view to trigger next batches (now loads 3 at once)
     await page.locator('#searchSentinel').scrollIntoViewIfNeeded();
-    await page.waitForTimeout(800);
+    await page.waitForTimeout(1200);
 
-    // Now more items should be rendered
+    // Now more items should be rendered (up to 3 batches of 50)
     const afterScrollCount = await page.locator('.food-item').count();
     expect(afterScrollCount).toBeGreaterThan(initialCount);
-    expect(afterScrollCount).toBeLessThanOrEqual(100); // 2nd page = 100 max
+    expect(afterScrollCount).toBeLessThanOrEqual(200); // max 4 batches total (50 + 3×50)
   });
 
   test('infinite scroll: search query resets pagination', async ({ page }) => {