fix(web): lecteur CBZ/CBR mode vertical — capturer naturalWidth/naturalHeight avant neutralisation de currentTarget par React (régression #37)

apps/web/src/reader/CbzReader.tsx

@@ -217,9 +217,10 @@ export function CbzReader({
                 loading="lazy"
                 style={verticalImageStyle(item.page)}
                 onLoad={(event) => {
+                  const { naturalWidth, naturalHeight } = event.currentTarget;
                   setImageSizes((current) => ({
                     ...current,
-                    [item.page]: { width: event.currentTarget.naturalWidth, height: event.currentTarget.naturalHeight }
+                    [item.page]: { width: naturalWidth, height: naturalHeight }
                   }));
                 }}
                 onError={() => setPageError(`Page ${item.page} indisponible.`)}