add touch swipe to overlay carousel

src/components/Map/markerManager.js

@@ -519,6 +519,20 @@ function initModalGallery(modalWrap, gallery) {
     });
   });
   setActive(0);
+  let touchStartX = 0;
+  const touchThreshold = 30;
+  heroImg.addEventListener("touchstart", (event) => {
+    if (!event.touches?.length) return;
+    touchStartX = event.touches[0].clientX;
+  });
+  heroImg.addEventListener("touchend", (event) => {
+    if (!event.changedTouches?.length) return;
+    const dx = event.changedTouches[0].clientX - touchStartX;
+    if (Math.abs(dx) < touchThreshold) return;
+    const direction = dx > 0 ? -1 : 1;
+    const nextIndex = (activeIndex + direction + gallery.length) % gallery.length;
+    setActive(nextIndex);
+  });
 }
 
 function openImageLightbox(src) {