fix(post): some links to images could be embedded as videos

same as https://github.com/plebbit/seedit/issues/385

src/lib/utils/media-utils.ts

@@ -80,7 +80,8 @@ export const getLinkMediaInfo = memoize(
     }
 
     try {
-      const fileName = url.pathname.slice(url.pathname.lastIndexOf('/') + 1).toLowerCase();
+      const fileName = url.pathname.split('/').pop() || '';
+      if (fileName.includes('.')) {
         mime = extName(fileName)[0]?.mime;
         if (mime) {
           if (mime.startsWith('image')) {
@@ -91,6 +92,7 @@ export const getLinkMediaInfo = memoize(
             type = 'audio';
           }
         }
+      }
 
       if (canEmbed(url) || url.host.startsWith('yt.')) {
         type = 'iframe';