fix: sửa lỗi hiển thị logo trên trang pdf

frontend/src/components/PublicPhotoModal.tsx

@@ -402,7 +402,7 @@ export const PublicPhotoModal: React.FC<PublicPhotoModalProps> = ({
 
             <a
               href={`${window.location.origin}/api/v1/public-photos/${photo.id}/share`}
-              className="w-full h-auto max-h-[85vh] object-contain cursor-zoom-in md:h-full md:max-h-none flex items-center justify-center"
+              className="w-full h-auto max-h-[85vh] object-contain cursor-zoom-in md:h-full md:max-h-none flex items-center justify-center relative"
               onClick={(e) => {
                 e.preventDefault();
                 setIsFullscreen(true);
@@ -411,8 +411,13 @@ export const PublicPhotoModal: React.FC<PublicPhotoModalProps> = ({
               <img
                 src={photo.imageUrl}
                 alt="Public Map Upload"
-                className="w-full h-auto max-h-[85vh] object-contain md:h-full md:max-h-none"
+                className="w-full h-auto max-h-[85vh] object-contain md:h-full md:max-h-none select-none"
+                draggable={false}
               />
+              {/* Shield overlay to prevent Save Image As on right-click / long press for non-owners */}
+              {!isAuthorized && (
+                <div className="absolute inset-0 bg-transparent select-none z-10" />
+              )}
             </a>
           </div>