swipe bug fix

frontend/src/main.jsx

@@ -59,7 +59,9 @@ if ('serviceWorker' in navigator) {
 
   document.addEventListener('touchmove', function (e) {
     if (e.touches.length === 2 && pinchStartDist !== null) {
-      // Two-finger pinch: scale fonts, not viewport
+      // Two-finger pinch: scale fonts, not viewport.
+      // Skip when a lightbox is open — let the browser handle pinch natively there.
+      if (document.documentElement.dataset.lightboxOpen) return;
       e.preventDefault();
       const ratio = getTouchDist(e) / pinchStartDist;
       const newScale = Math.min(MAX_SCALE, Math.max(MIN_SCALE, pinchStartScale * ratio));